CVE-2021-26355

Name: CVE-2021-26355
Creator: NVD / NIST
Published: 2023-01-11T08:15:11.383+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.17%

Last modified Jun 17, 2026

CVE-2021-26355 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service. . EPSS estimates a 0.17% chance of exploitation in the next 30 days.

Description

Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.17%

6.7th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-693

Affected Software

Vendor	Product	Versions
Amd	Epyc 7003 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 72f3 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7313 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7313p Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7343 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7373x Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 73f3 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7413 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7443 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7443p Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7453 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 74f3 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7513 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7543 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7543p Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7573x Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 75f3 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7643 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7663 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7713 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7713p Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7743 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7763 Firmware	< milanpi-sp3_1.0.0.7
Amd	Epyc 7773x Firmware	< milanpi-sp3_1.0.0.7

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-2021-26355?

Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service.

How severe is CVE-2021-26355?

CVE-2021-26355 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26355?

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-2021-26355?

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

Scan your code now

Source: NVD / NIST