What is CVE-2021-26379?

CVE-2021-26379 is a critical-severity vulnerability in AMD 2nd Gen Epyc™. CVSS score: 9.8/10. Published 2023-05-09.

How severe is CVE-2021-26379?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in AMD 2nd Gen Epyc™

CVE-2021-26379

Insufficient input validation of mailbox data in the SMU may allow an attacker to coerce the SMU to corrupt SMRAM, potentially leading to a loss of integrity and privilege escalation.

Published 2023-05-09 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.007 (52.0th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 52nd percentile — 52.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

References

www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001 (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26379?: CVE-2021-26379 is a critical-severity vulnerability in AMD 2nd Gen Epyc™. CVSS score: 9.8/10. Published 2023-05-09.
How severe is CVE-2021-26379?: Critical severity. CVSS v3 base score is 9.8 out of 10.