CVE-2021-26402

7.1 HIGH 0.2% exploit odds Fix listed

What it is

Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of integrity and availability.

At a glance

Exploitability: Can be exploited locally on the machine with a low-privilege account. High risk of data tampering, service disruption.
Exploit odds: 0.2% chance of exploitation in the next 30 days (EPSS).
Fix: A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

2023-01-11 08:15 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: 0.2% in the next 30 days (EPSS).
Severity: 7.1 HIGH (CVSS).
Fix: a patch or advisory is linked.

Details

Published: 2023-01-11 08:15 UTC
Last modified: 2026-06-17 03:43 UTC
Exploit probability: 0.2% · EPSS, next 30 days
Weakness: CWE-787 · Out-of-bounds write
Record status: Modified

Affected

Amd Epyc 7h12 Firmware < romepi_1.0.0.c
Amd Epyc 7f72 Firmware < romepi_1.0.0.c
Amd Epyc 7f52 Firmware < romepi_1.0.0.c
Amd Epyc 7f32 Firmware < romepi_1.0.0.c
Amd Epyc 7742 Firmware < romepi_1.0.0.c
Amd Epyc 7702p Firmware < romepi_1.0.0.c
Amd Epyc 7702 Firmware < romepi_1.0.0.c
Amd Epyc 7662 Firmware < romepi_1.0.0.c

Attack profile CVSS 3.1 · 7.1

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

Raw vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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-2021-26402.md and follow it. Check whether this project is affected by CVE-2021-26402. 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