CVE-2021-26328

Name: CVE-2021-26328
Creator: NVD / NIST
Published: 2023-01-11T08:15:10.447+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.18%

Last modified Jun 17, 2026

CVE-2021-26328 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. Failure to verify the mode of CPU execution at the time of SNP_INIT may lead to a potential loss of memory integrity for SNP guests. . EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

Failure to verify the mode of CPU execution at the time of SNP_INIT may lead to a potential loss of memory integrity for SNP guests.

Metrics

CVSS 3.1

4.4/10

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

EPSS Probability

0.18%

8.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-358

Affected Software

Vendor	Product	Versions
Amd	Epyc 7003 Firmware	< milanpi_1.0.0.8
Amd	Epyc 72f3 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7313 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7313p Firmware	< milanpi_1.0.0.8
Amd	Epyc 7343 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7373x Firmware	< milanpi_1.0.0.8
Amd	Epyc 73f3 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7413 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7443 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7443p Firmware	< milanpi_1.0.0.8
Amd	Epyc 7453 Firmware	< milanpi_1.0.0.8
Amd	Epyc 74f3 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7513 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7543 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7543p Firmware	< milanpi_1.0.0.8
Amd	Epyc 7573x Firmware	< milanpi_1.0.0.8
Amd	Epyc 75f3 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7643 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7663 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7713 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7713p Firmware	< milanpi_1.0.0.8
Amd	Epyc 7743 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7763 Firmware	< milanpi_1.0.0.8
Amd	Epyc 7773x Firmware	< milanpi_1.0.0.8

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032Vendor Advisory

Timeline

Published: Jan 11, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26328?

Failure to verify the mode of CPU execution at the time of SNP_INIT may lead to a potential loss of memory integrity for SNP guests.

How severe is CVE-2021-26328?

CVE-2021-26328 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26328?

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-2021-26328?

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

Scan your code now

Source: NVD / NIST