CVE-2021-26327

Name: CVE-2021-26327
Creator: NVD / NIST
Published: 2021-11-16T19:15:07.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.23%

Last modified Jun 17, 2026

CVE-2021-26327 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Insufficient validation of guest context in the SNP Firmware could lead to a potential loss of guest confidentiality.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.

Description

Insufficient validation of guest context in the SNP Firmware could lead to a potential loss of guest confidentiality.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.23%

14.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Amd	Epyc 7003 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 72f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7313 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7313p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7343 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 73f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7413 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7443 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7443p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7453 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 74f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7513 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7543 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7543p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 75f3 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7643 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7663 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7713 Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7713p Firmware	< milanpi-sp3_1.0.0.4
Amd	Epyc 7763 Firmware	< milanpi-sp3_1.0.0.4

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021Vendor Advisory

Timeline

Published: Nov 16, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26327?

Insufficient validation of guest context in the SNP Firmware could lead to a potential loss of guest confidentiality.

How severe is CVE-2021-26327?

CVE-2021-26327 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.23% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26327?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26327?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST