CVE-2021-26404

What it is

Improper input validation and bounds checking in SEV firmware may leak scratch buffer bytes leading to potential information disclosure.

At a glance

Exploitability

Can be exploited locally on the machine with a low-privilege account. High risk of data exposure.

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

1. 2023-01-11 08:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 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: 5.5 MEDIUM (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-20 · Improper input validation

Record status

Modified

Affected

• Amd Epyc 7003 Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 7313 Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 7313p Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 7343 Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 7373x Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 73f3 Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 7413 Firmware < milanpi-sp3_1.0.0.9
• Amd Epyc 7443 Firmware < milanpi-sp3_1.0.0.9

Attack profile CVSS 3.1 · 5.5

Attack vector

Local

Complexity

Low

Privileges needed

Low

User interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

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-2021-26404.md and follow it. Check whether this project is affected by CVE-2021-26404. 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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