# What is CVE-2023-20530? > CVE-2023-20530 is a high-severity flaw (CVSS 7.5) in Epyc 7003 Firmware from Amd, published on 11 January 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 0.6%. If you run an affected version, plan in the vendor’s fix. Canonical page: https://www.precursorintelligence.com/what-is/cve-2023-20530 ## 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:** 47 out of 100 (Medium); action: Plan remediation. Kept up to date as the evidence changes. - **Severity:** High (CVSS 7.5 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:** 0.6% (latest exploit-likelihood forecast) - **Published:** 11 January 2023 - **Record last updated:** 7 April 2025 - **Main product:** Epyc 7003 Firmware from Amd - **Affected products:** 48 ## What is CVE-2023-20530? In plain terms It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline. ### The official description Insufficient input validation of BIOS mailbox messages in SMU may result in out-of-bounds memory reads potentially resulting in a denial of service. ### What kind of flaw is it? - CWE-20: Improper Input Validation ### How an attack on it works - Where an attacker can be: Anywhere on the internet - How hard it is to pull off: Easy: no special conditions - Login needed first: No login needed - Does someone have to click: No, nobody has to do anything - What an attacker gets: Can take it offline Severity vector: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H` ## Is CVE-2023-20530 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 0.6%. That can change at any time, which is why we keep watching. Exploit likelihood over the last 7 days: 0.6%, 0.6%, 0.6%, 0.6%, 0.6%, 0.6%, 0.6%. ### Timeline - 11 January 2023: Published - 7 April 2025: Record last updated ### How Precursor Intelligence ranks it CVE-2023-20530 scores **47 out of 100 (Medium)**, with the action "Plan remediation". 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-2023-20530? The published record lists 48 products. Versions are as published: "before milanpi_1.0.0.5" means every version up to, but not including, milanpi_1.0.0.5. - [Epyc 7003 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7003_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.5 - [Epyc 7003](https://www.precursorintelligence.com/product/amd/epyc_7003) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 - [Epyc 7743](https://www.precursorintelligence.com/product/amd/epyc_7743) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Epyc 7743 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7743_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi_1.0.0.5 - [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_1.0.0.5 - [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_1.0.0.5 ## How do I fix CVE-2023-20530? 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 advisory 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-1032) (Vendor advisory) ## Questions ### What is CVE-2023-20530? CVE-2023-20530 is a high-severity flaw in Epyc 7003 Firmware from Amd, published on 11 January 2023. It can be attacked from anywhere on the internet without logging in, and nobody has to click anything. If it works, the attacker can take it offline. ### How serious is CVE-2023-20530? It scores 7.5 out of 10 on the CVSS severity scale, which is high. Our risk score for CVE-2023-20530 is 47 out of 100, which is Medium. Its action is "Plan remediation". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2023-20530 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 0.6%. That can change at any time, which is why we keep watching. ### Which versions does CVE-2023-20530 affect? For Epyc 7003 Firmware from Amd: before milanpi_1.0.0.5. The record lists 48 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2023-20530? 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-2023-20530 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