# What is CVE-2021-26339? > CVE-2021-26339 is a medium-severity flaw (CVSS 5.5) in Epyc 7763 Firmware from Amd, published on 11 May 2022. 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-2021-26339 ## 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:** 23 out of 100 (Low); action: Monitor. Kept up to date as the evidence changes. - **Severity:** Medium (CVSS 5.5 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:** 0.3% (latest exploit-likelihood forecast) - **Published:** 11 May 2022 - **Record last updated:** 23 May 2022 - **Main product:** Epyc 7763 Firmware from Amd - **Affected products:** 168 ## What is CVE-2021-26339? In plain terms An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. If it works, the attacker can take it offline. ### The official description A bug in AMD CPU’s core logic may allow for an attacker, using specific code from an unprivileged VM, to trigger a CPU core hang resulting in a potential denial of service. AMD believes the specific code includes a specific x86 instruction sequence that would not be generated by compilers. ### What kind of flaw is it? - Unknown: Unknown ### How an attack on it works - Where an attacker can be: Already on the device - How hard it is to pull off: Easy: no special conditions - Login needed first: An ordinary user account - 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:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H` ## Is CVE-2021-26339 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 - 11 May 2022: Published - 23 May 2022: Record last updated ### How Precursor Intelligence ranks it CVE-2021-26339 scores **23 out of 100 (Low)**, with the action "Monitor". 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-2021-26339? The published record lists 168 products. Versions are as published: "before milanpi-sp3_1.0.0.7" means every version up to, but not including, milanpi-sp3_1.0.0.7. - [Epyc 7763 Firmware](https://www.precursorintelligence.com/product/amd/epyc_7763_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before milanpi-sp3_1.0.0.7 - [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-sp3_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-sp3_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-sp3_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-sp3_1.0.0.7 - [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-sp3_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-sp3_1.0.0.7 - [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-sp3_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-sp3_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-sp3_1.0.0.7 - [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-sp3_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-sp3_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-sp3_1.0.0.7 - [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-sp3_1.0.0.7 - [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-sp3_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-sp3_1.0.0.7 - [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-sp3_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-sp3_1.0.0.7 - [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-sp3_1.0.0.7 - [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-sp3_1.0.0.7 - [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-sp3_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-sp3_1.0.0.7 - [Epyc 7763](https://www.precursorintelligence.com/product/amd/epyc_7763) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [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-sp3_1.0.0.7 - [Ryzen 3 2200u](https://www.precursorintelligence.com/product/amd/ryzen_3_2200u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 2200u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_2200u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 3 2300u](https://www.precursorintelligence.com/product/amd/ryzen_3_2300u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 2300u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_2300u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 3 3100](https://www.precursorintelligence.com/product/amd/ryzen_3_3100) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3100 Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3100_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 3 3300g](https://www.precursorintelligence.com/product/amd/ryzen_3_3300g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3300g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3300g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 3 3300x](https://www.precursorintelligence.com/product/amd/ryzen_3_3300x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 3300x Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_3300x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 3 4300g](https://www.precursorintelligence.com/product/amd/ryzen_3_4300g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 4300g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_4300g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 3 4300ge](https://www.precursorintelligence.com/product/amd/ryzen_3_4300ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 4300ge Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_4300ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 3 5125c](https://www.precursorintelligence.com/product/amd/ryzen_3_5125c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 5125c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_5125c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 3 5300g](https://www.precursorintelligence.com/product/amd/ryzen_3_5300g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 5300g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_5300g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 3 5300ge](https://www.precursorintelligence.com/product/amd/ryzen_3_5300ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 5300ge Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_5300ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 3 5400u](https://www.precursorintelligence.com/product/amd/ryzen_3_5400u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 5400u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_5400u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 3 5425c](https://www.precursorintelligence.com/product/amd/ryzen_3_5425c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 5425c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_5425c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 3 5425u](https://www.precursorintelligence.com/product/amd/ryzen_3_5425u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 5425u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_5425u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 3 Pro 2300u](https://www.precursorintelligence.com/product/amd/ryzen_3_pro_2300u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 Pro 2300u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_pro_2300u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 3 Pro 3300u](https://www.precursorintelligence.com/product/amd/ryzen_3_pro_3300u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 3 Pro 3300u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_3_pro_3300u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 2500u](https://www.precursorintelligence.com/product/amd/ryzen_5_2500u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 2500u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_2500u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 2600h](https://www.precursorintelligence.com/product/amd/ryzen_5_2600h) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 2600h Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_2600h_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 3400g](https://www.precursorintelligence.com/product/amd/ryzen_5_3400g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3400g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3400g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 3450g](https://www.precursorintelligence.com/product/amd/ryzen_5_3450g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3450g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3450g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 3600](https://www.precursorintelligence.com/product/amd/ryzen_5_3600) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3600 Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3600_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 3600x](https://www.precursorintelligence.com/product/amd/ryzen_5_3600x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 3600x Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_3600x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 4600g](https://www.precursorintelligence.com/product/amd/ryzen_5_4600g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 4600g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_4600g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 5 4600ge](https://www.precursorintelligence.com/product/amd/ryzen_5_4600ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 4600ge Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_4600ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 5 5560u](https://www.precursorintelligence.com/product/amd/ryzen_5_5560u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5560u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5560u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 5 5600h](https://www.precursorintelligence.com/product/amd/ryzen_5_5600h) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5600h Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5600h_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 5 5600hs](https://www.precursorintelligence.com/product/amd/ryzen_5_5600hs) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5600hs Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5600hs_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 5 5600u](https://www.precursorintelligence.com/product/amd/ryzen_5_5600u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5600u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5600u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 5 5625c](https://www.precursorintelligence.com/product/amd/ryzen_5_5625c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5625c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5625c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 5 5625u](https://www.precursorintelligence.com/product/amd/ryzen_5_5625u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5625u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5625u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 5 5700g](https://www.precursorintelligence.com/product/amd/ryzen_5_5700g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5700g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5700g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 5 5700ge](https://www.precursorintelligence.com/product/amd/ryzen_5_5700ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 5700ge Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_5700ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 5 Pro 2500u](https://www.precursorintelligence.com/product/amd/ryzen_5_pro_2500u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 Pro 2500u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_pro_2500u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 5 Pro 3500u](https://www.precursorintelligence.com/product/amd/ryzen_5_pro_3500u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 5 Pro 3500u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_5_pro_3500u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 7 2700u](https://www.precursorintelligence.com/product/amd/ryzen_7_2700u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 2700u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_2700u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 7 2800h](https://www.precursorintelligence.com/product/amd/ryzen_7_2800h) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 2800h Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_2800h_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 7 3700x](https://www.precursorintelligence.com/product/amd/ryzen_7_3700x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 3700x Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_3700x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 7 3800x](https://www.precursorintelligence.com/product/amd/ryzen_7_3800x) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 3800x Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_3800x_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 7 4700g](https://www.precursorintelligence.com/product/amd/ryzen_7_4700g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 4700g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_4700g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 7 4700ge](https://www.precursorintelligence.com/product/amd/ryzen_7_4700ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 4700ge Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_4700ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 7 5700g](https://www.precursorintelligence.com/product/amd/ryzen_7_5700g) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5700g Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5700g_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 7 5700ge](https://www.precursorintelligence.com/product/amd/ryzen_7_5700ge) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5700ge Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5700ge_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before comboam4_v2_pi_1.2.0.6c - [Ryzen 7 5800h](https://www.precursorintelligence.com/product/amd/ryzen_7_5800h) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5800h Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5800h_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 7 5800hs](https://www.precursorintelligence.com/product/amd/ryzen_7_5800hs) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5800hs Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5800hs_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 7 5800u](https://www.precursorintelligence.com/product/amd/ryzen_7_5800u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5800u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5800u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 7 5825c](https://www.precursorintelligence.com/product/amd/ryzen_7_5825c) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5825c Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5825c_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 7 5825u](https://www.precursorintelligence.com/product/amd/ryzen_7_5825u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 5825u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_5825u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 7 Pro 2700u](https://www.precursorintelligence.com/product/amd/ryzen_7_pro_2700u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 Pro 2700u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_pro_2700u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 7 Pro 3700u](https://www.precursorintelligence.com/product/amd/ryzen_7_pro_3700u) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 7 Pro 3700u Firmware](https://www.precursorintelligence.com/product/amd/ryzen_7_pro_3700u_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen 9 5900hs](https://www.precursorintelligence.com/product/amd/ryzen_9_5900hs) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 9 5900hs Firmware](https://www.precursorintelligence.com/product/amd/ryzen_9_5900hs_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 9 5900hx](https://www.precursorintelligence.com/product/amd/ryzen_9_5900hx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 9 5900hx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_9_5900hx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 9 5980hs](https://www.precursorintelligence.com/product/amd/ryzen_9_5980hs) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 9 5980hs Firmware](https://www.precursorintelligence.com/product/amd/ryzen_9_5980hs_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen 9 5980hx](https://www.precursorintelligence.com/product/amd/ryzen_9_5980hx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen 9 5980hx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_9_5980hx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): before cezannepi-fp6_1.0.0.9a - [Ryzen Threadripper Pro 3945wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3945wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 3945wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3945wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): all versions - [Ryzen Threadripper Pro 3955wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3955wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 3955wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3955wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 3975wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3975wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 3975wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3975wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 3995wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3995wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 3995wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_3995wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 5945wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5945wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 5945wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5945wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 5955wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5955wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 5955wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5955wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 5965wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5965wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 5965wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5965wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 5975wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5975wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 5975wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5975wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified - [Ryzen Threadripper Pro 5995wx](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5995wx) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Hardware): version not specified - [Ryzen Threadripper Pro 5995wx Firmware](https://www.precursorintelligence.com/product/amd/ryzen_threadripper_pro_5995wx_firmware) by [Amd](https://www.precursorintelligence.com/vendors/amd) (Operating system): version not specified ## How do I fix CVE-2021-26339? 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-1027) (Vendor advisory) - [amd.com](https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028) (Vendor advisory) ## Questions ### What is CVE-2021-26339? CVE-2021-26339 is a medium-severity flaw in Epyc 7763 Firmware from Amd, published on 11 May 2022. An attacker has to be already on the device with an ordinary user account, and nobody has to click anything. If it works, the attacker can take it offline. ### How serious is CVE-2021-26339? It scores 5.5 out of 10 on the CVSS severity scale, which is medium. Our risk score for CVE-2021-26339 is 23 out of 100, which is Low. Its action is "Monitor". No sign of exploitation and a low forecast. Patch it in your normal update cycle. ### Is CVE-2021-26339 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-2021-26339 affect? For Epyc 7763 Firmware from Amd: before milanpi-sp3_1.0.0.7. The record lists 168 products in all, each with its versions, under "Who is affected" on this page. ### How do I fix CVE-2021-26339? 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-2021-26339 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