What is CVE-2021-26372?

CVE-2021-26372 is a medium-severity vulnerability in AMD Athlon™ Series, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2022-05-11.

How severe is CVE-2021-26372?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Buffer overflow in AMD Athlon™ Series

CVE-2021-26372

Insufficient bound checks related to PCIE in the System Management Unit (SMU) may result in access to an invalid address space that could result in denial of service.

Vulnerability class: Buffer Overflow

Published 2022-05-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.002 (10.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 11th percentile — 10.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer

References

www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027 (Vendor Advisory)
www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028 (Vendor Advisory)

Frequently asked questions

What is CVE-2021-26372?: CVE-2021-26372 is a medium-severity vulnerability in AMD Athlon™ Series, classified under Improper Restriction of Operations within the Bounds of a Memory Buffer. CVSS score: 5.5/10. Published 2022-05-11.
How severe is CVE-2021-26372?: Medium severity. CVSS v3 base score is 5.5 out of 10.