# What is CVE-2023-20521? > CVE-2023-20521 is a medium-severity flaw (CVSS 5.7) in Epyc 7001 Firmware from Amd, published on 14 November 2023. It is not on the list of flaws known to be exploited today. The latest forecast puts its chance of use in the next 30 days at 0.3%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2023-20521 ## At a glance - **Verdict:** Plan it in. No sign of exploitation and a low forecast. Patch it in your normal update cycle. - **Precursor Intelligence risk score:** 17 out of 100 (Info); action: Track. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 5.7 out of 10) - **Known to be exploited:** No, not on the list of flaws known to be exploited today - **Chance of use in the next 30 days:** 0.3% (latest exploit-likelihood forecast) - **Published:** 14 November 2023 - **Record last updated:** 18 June 2024 - **Main product:** Epyc 7001 Firmware from Amd - **Affected products:** 186 ## What is CVE-2023-20521? In plain terms An attacker has to be physically at the device without logging in, and nobody has to click anything. If it works, the attacker can read data and take it offline. ### The official description TOCTOU in the ASP Bootloader may allow an attacker with physical access to tamper with SPI ROM records after memory content verification, potentially leading to loss of confidentiality or a denial of service. ### What kind of flaw is it? - CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition ### How an attack on it works - Where an attacker can be: Physically at the device - How hard it is to pull off: Hard: conditions must line up - Login needed first: No login needed - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can read data and take it offline Severity vector: `CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H` ## Is CVE-2023-20521 being exploited? Not that we know of It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.3%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%, 0.3%. ### Timeline - 14 November 2023: Published - 18 June 2024: Record last updated ### How Precursor Intelligence ranks it CVE-2023-20521 scores **17 out of 100 (Info)**, with the action "Track". Every published flaw gets a risk score from 0 to 100, kept up to date as the evidence changes. Four things go into the score, from the one that counts most to the ones that count less: - Evidence it is being exploited: biggest factor - How severe it is: strong factor - How widely exposed it is: smaller factor - Threat activity around it: smaller factor 85 and above is Critical. Anything confirmed as exploited is always marked for an emergency patch, whatever its score. When this flaw matches software you track, it lands in your list with its score and the reasons behind it. ## Who is affected by CVE-2023-20521? The published record lists 186 products. Versions are as published: "before naplespi_1.0.0.h" means every version up to, but not including, naplespi_1.0.0.h. - [Epyc 7001 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7001_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Amd 3015ce](https://www.precursorintelligence.com/product/amd/amd_3015ce) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Amd 3015ce Firmware](https://www.precursorintelligence.com/product/amd/amd_3015ce_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before pollockpi-ft5_1.0.0.4 - [Amd 3015e](https://www.precursorintelligence.com/product/amd/amd_3015e) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Amd 3015e Firmware](https://www.precursorintelligence.com/product/amd/amd_3015e_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before pollockpi-ft5_1.0.0.4 - [Athlon Gold 3150g](https://www.precursorintelligence.com/product/amd/athlon_gold_3150g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Athlon Gold 3150g Firmware](https://www.precursorintelligence.com/product/amd/athlon_gold_3150g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Athlon Gold Pro 3150g](https://www.precursorintelligence.com/product/amd/athlon_gold_pro_3150g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Athlon Gold Pro 3150g Firmware](https://www.precursorintelligence.com/product/amd/athlon_gold_pro_3150g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Athlon Gold Pro 3150ge](https://www.precursorintelligence.com/product/amd/athlon_gold_pro_3150ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Athlon Gold Pro 3150ge Firmware](https://www.precursorintelligence.com/product/amd/athlon_gold_pro_3150ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Athlon Pro 300ge](https://www.precursorintelligence.com/product/amd/athlon_pro_300ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Athlon Pro 300ge Firmware](https://www.precursorintelligence.com/product/amd/athlon_pro_300ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Epyc 7001](https://www.precursorintelligence.com/product/amd/epyc_7001) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7203](https://www.precursorintelligence.com/product/amd/epyc_7203) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7203 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7203_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7203p](https://www.precursorintelligence.com/product/amd/epyc_7203p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7203p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7203p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7232p](https://www.precursorintelligence.com/product/amd/epyc_7232p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7232p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7232p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7251](https://www.precursorintelligence.com/product/amd/epyc_7251) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7251 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7251_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7252](https://www.precursorintelligence.com/product/amd/epyc_7252) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7252 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7252_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7261](https://www.precursorintelligence.com/product/amd/epyc_7261) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7261 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7261_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7262](https://www.precursorintelligence.com/product/amd/epyc_7262) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7262 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7262_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7272](https://www.precursorintelligence.com/product/amd/epyc_7272) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7272 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7272_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7281](https://www.precursorintelligence.com/product/amd/epyc_7281) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7281 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7281_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7282](https://www.precursorintelligence.com/product/amd/epyc_7282) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7282 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7282_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 72f3](https://www.precursorintelligence.com/product/amd/epyc_72f3) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 72f3 Firmware](https://www.precursorintelligence.com/product/amd/epyc_72f3_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7301](https://www.precursorintelligence.com/product/amd/epyc_7301) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7301 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7301_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7302](https://www.precursorintelligence.com/product/amd/epyc_7302) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7302 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7302_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7302p](https://www.precursorintelligence.com/product/amd/epyc_7302p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7302p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7302p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7303](https://www.precursorintelligence.com/product/amd/epyc_7303) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7303 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7303_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7303p](https://www.precursorintelligence.com/product/amd/epyc_7303p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7303p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7303p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7313](https://www.precursorintelligence.com/product/amd/epyc_7313) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7313 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7313_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7313p](https://www.precursorintelligence.com/product/amd/epyc_7313p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7313p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7313p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7343](https://www.precursorintelligence.com/product/amd/epyc_7343) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7343 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7343_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7351](https://www.precursorintelligence.com/product/amd/epyc_7351) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7351 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7351_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7351p](https://www.precursorintelligence.com/product/amd/epyc_7351p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7351p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7351p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7352](https://www.precursorintelligence.com/product/amd/epyc_7352) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7352 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7352_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7371](https://www.precursorintelligence.com/product/amd/epyc_7371) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7371 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7371_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7373x](https://www.precursorintelligence.com/product/amd/epyc_7373x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7373x Firmware](https://www.precursorintelligence.com/product/amd/epyc_7373x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 73f3](https://www.precursorintelligence.com/product/amd/epyc_73f3) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 73f3 Firmware](https://www.precursorintelligence.com/product/amd/epyc_73f3_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7401](https://www.precursorintelligence.com/product/amd/epyc_7401) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7401 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7401_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7401p](https://www.precursorintelligence.com/product/amd/epyc_7401p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7401p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7401p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7402](https://www.precursorintelligence.com/product/amd/epyc_7402) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7402 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7402_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7402p](https://www.precursorintelligence.com/product/amd/epyc_7402p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7402p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7402p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7413](https://www.precursorintelligence.com/product/amd/epyc_7413) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7413 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7413_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7443](https://www.precursorintelligence.com/product/amd/epyc_7443) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7443 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7443_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7443p](https://www.precursorintelligence.com/product/amd/epyc_7443p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7443p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7443p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7451](https://www.precursorintelligence.com/product/amd/epyc_7451) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7451 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7451_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7452](https://www.precursorintelligence.com/product/amd/epyc_7452) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7452 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7452_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7453](https://www.precursorintelligence.com/product/amd/epyc_7453) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7453 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7453_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7473x](https://www.precursorintelligence.com/product/amd/epyc_7473x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7473x Firmware](https://www.precursorintelligence.com/product/amd/epyc_7473x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 74f3](https://www.precursorintelligence.com/product/amd/epyc_74f3) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 74f3 Firmware](https://www.precursorintelligence.com/product/amd/epyc_74f3_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7501](https://www.precursorintelligence.com/product/amd/epyc_7501) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7501 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7501_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7502](https://www.precursorintelligence.com/product/amd/epyc_7502) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7502 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7502_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7502p](https://www.precursorintelligence.com/product/amd/epyc_7502p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7502p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7502p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7513](https://www.precursorintelligence.com/product/amd/epyc_7513) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7513 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7513_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7532](https://www.precursorintelligence.com/product/amd/epyc_7532) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7532 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7532_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7542](https://www.precursorintelligence.com/product/amd/epyc_7542) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7542 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7542_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7543](https://www.precursorintelligence.com/product/amd/epyc_7543) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7543 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7543_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7543p](https://www.precursorintelligence.com/product/amd/epyc_7543p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7543p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7543p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7551](https://www.precursorintelligence.com/product/amd/epyc_7551) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7551 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7551_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7551p](https://www.precursorintelligence.com/product/amd/epyc_7551p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7551p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7551p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7552](https://www.precursorintelligence.com/product/amd/epyc_7552) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7552 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7552_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7573x](https://www.precursorintelligence.com/product/amd/epyc_7573x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7573x Firmware](https://www.precursorintelligence.com/product/amd/epyc_7573x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 75f3](https://www.precursorintelligence.com/product/amd/epyc_75f3) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 75f3 Firmware](https://www.precursorintelligence.com/product/amd/epyc_75f3_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7601](https://www.precursorintelligence.com/product/amd/epyc_7601) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7601 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7601_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before naplespi_1.0.0.h - [Epyc 7642](https://www.precursorintelligence.com/product/amd/epyc_7642) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7642 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7642_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7643](https://www.precursorintelligence.com/product/amd/epyc_7643) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7643 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7643_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7643p](https://www.precursorintelligence.com/product/amd/epyc_7643p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7643p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7643p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7662](https://www.precursorintelligence.com/product/amd/epyc_7662) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7662 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7662_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7663](https://www.precursorintelligence.com/product/amd/epyc_7663) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7663 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7663_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7663p](https://www.precursorintelligence.com/product/amd/epyc_7663p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7663p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7663p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7702](https://www.precursorintelligence.com/product/amd/epyc_7702) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7702 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7702_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7702p](https://www.precursorintelligence.com/product/amd/epyc_7702p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7702p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7702p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7713](https://www.precursorintelligence.com/product/amd/epyc_7713) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7713 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7713_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7713p](https://www.precursorintelligence.com/product/amd/epyc_7713p) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7713p Firmware](https://www.precursorintelligence.com/product/amd/epyc_7713p_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7742](https://www.precursorintelligence.com/product/amd/epyc_7742) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7742 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7742_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7763](https://www.precursorintelligence.com/product/amd/epyc_7763) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7763 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7763_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7773x](https://www.precursorintelligence.com/product/amd/epyc_7773x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7773x Firmware](https://www.precursorintelligence.com/product/amd/epyc_7773x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.7 - [Epyc 7f32](https://www.precursorintelligence.com/product/amd/epyc_7f32) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7f32 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7f32_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7f52](https://www.precursorintelligence.com/product/amd/epyc_7f52) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7f52 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7f52_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7f72](https://www.precursorintelligence.com/product/amd/epyc_7f72) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7f72 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7f72_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Epyc 7h12](https://www.precursorintelligence.com/product/amd/epyc_7h12) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7h12 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7h12_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before romepi_1.0.0.d - [Ryzen 3 3200u](https://www.precursorintelligence.com/product/amd/ryzen_3_3200u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3200u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3200u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 3 3250c](https://www.precursorintelligence.com/product/amd/ryzen_3_3250c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3250c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3250c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 3 3250u](https://www.precursorintelligence.com/product/amd/ryzen_3_3250u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3250u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3250u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 3 3300u](https://www.precursorintelligence.com/product/amd/ryzen_3_3300u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3300u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3300u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 3 3350u](https://www.precursorintelligence.com/product/amd/ryzen_3_3350u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3350u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3350u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 5 3450u](https://www.precursorintelligence.com/product/amd/ryzen_5_3450u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3450u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3450u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 5 3500c](https://www.precursorintelligence.com/product/amd/ryzen_5_3500c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3500c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3500c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 5 3500u](https://www.precursorintelligence.com/product/amd/ryzen_5_3500u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3500u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3500u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 5 3550h](https://www.precursorintelligence.com/product/amd/ryzen_5_3550h) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3550h Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3550h_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 5 3580u](https://www.precursorintelligence.com/product/amd/ryzen_5_3580u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3580u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3580u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 7 3700c](https://www.precursorintelligence.com/product/amd/ryzen_7_3700c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 3700c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_3700c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 7 3700u](https://www.precursorintelligence.com/product/amd/ryzen_7_3700u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 3700u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_3700u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 7 3750h](https://www.precursorintelligence.com/product/amd/ryzen_7_3750h) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 3750h Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_3750h_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen 7 3780u](https://www.precursorintelligence.com/product/amd/ryzen_7_3780u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 3780u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_3780u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before picassopi-fp5_1.0.0.e - [Ryzen Threadripper 2920x](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2920x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper 2920x Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2920x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before summitpi-sp3r2_1.1.0.6 - [Ryzen Threadripper 2950x](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2950x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper 2950x Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2950x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before summitpi-sp3r2_1.1.0.6 - [Ryzen Threadripper 2970wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2970wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper 2970wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2970wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before summitpi-sp3r2_1.1.0.6 - [Ryzen Threadripper 2990wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2990wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper 2990wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_2990wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before summitpi-sp3r2_1.1.0.6 ## How do I fix CVE-2023-20521? 1. **Check whether you run it.** Compare your versions with the affected products above. Not sure what you run? Precursor Intelligence can work it out from your public website, or you can pick it from a list. 2. **Apply the vendor’s fix.** Install the update named in the vendor’s advisory. We’ve put the advisories and patch notes first in the list. 3. **If you can’t patch today.** Follow any mitigation the vendor publishes, and limit who can reach the affected system from the internet until the update is in. 4. **Keep an eye on it.** Track the product and we tell you as soon as we spot this flaw on the list of exploited flaws, or a jump in its exploit likelihood. ### References - [amd.com](https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3002) (Vendor advisory) - [amd.com](https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4002) (Vendor advisory) - [amd.com](https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-5001) ## Questions ### What is CVE-2023-20521? CVE-2023-20521 is a medium-severity flaw in Epyc 7001 Firmware from Amd, published on 14 November 2023. An attacker has to be physically at the device without logging in, and nobody has to click anything. If it works, the attacker can read data and take it offline. ### How serious is CVE-2023-20521? It scores 5.7 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2023-20521 is 17 out of 100, which is Info. Its action is "Track". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2023-20521 being exploited? It is not on the list of flaws known to be exploited today. The latest forecast puts the chance of it being used in the next 30 days at 0.3%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2023-20521 affect? For Epyc 7001 Firmware from Amd: before naplespi_1.0.0.h. The record lists 186 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2023-20521? Install the update the vendor names in its advisory, linked first under "How do I fix" on this page. If you can't patch today, follow the vendor's mitigation and limit who can reach the affected system from the internet. ## Does CVE-2023-20521 affect you? Precursor Intelligence keeps checking for you: - **Tell us what you run.** Pick your software from a list, or let us work it out from your website. - **We match it to every flaw.** Over 400,000 published flaws, checked against your list. - **Ranked by real-world risk.** Every flaw gets a 0 to 100 risk score, kept up to date, led by evidence criminals are using it. - **Told as soon as we know.** An alert by email, in the app or by webhook to your own tools. Start free (no card, nothing to install): https://www.precursorintelligence.com/register Book a demo: https://www.precursorintelligence.com/contact