CVE-2021-26339

5.5 MEDIUM 0.3% exploit odds Fix listed

What it is

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.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. High risk of service disruption.
Exploit odds: 0.3% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2022-05-11 17:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2026-06-17 03:43 UTC Last updatedMost recent change to the record

Why it ranks here

Exploited in the wild: no, CISA does not list it.
Exploit odds: 0.3% in the next 30 days (EPSS).
Severity: 5.5 MEDIUM (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2022-05-11 17:15 UTC
Last modified: 2026-06-17 03:43 UTC
Exploit probability: 0.3% · EPSS, next 30 days
Record status: Modified

Affected

Amd Epyc 7763 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7713p Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7713 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7663 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7643 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 75f3 Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7543p Firmware < milanpi-sp3_1.0.0.7
Amd Epyc 7543 Firmware < milanpi-sp3_1.0.0.7

Attack profile CVSS 3.1 · 5.5

Attack vector: Local
Complexity: Low
Privileges needed: Low
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Raw vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

Read https://cve-list.com/agent/cve/CVE-2021-26339.md and follow it. Check whether this project is affected by CVE-2021-26339. Read only. Don't change anything and don't upload my code. Tell me yes, no or not sure, with the file as proof.

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Fix and advisories

References

NVD record · CVE.org record