What is CVE-2021-26397?

CVE-2021-26397 is a high-severity vulnerability in AMD 3rd Gen Epyc™. CVSS score: 7.1/10. Published 2023-05-09.

How severe is CVE-2021-26397?

High severity. CVSS v3 base score is 7.1 out of 10.

Vulnerability in AMD 3rd Gen Epyc™

CVE-2021-26397

Insufficient address validation, may allow an attacker with a compromised ABL and UApp to corrupt sensitive memory locations potentially resulting in a loss of integrity or availability.

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

CVSS v3 metric

CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H.

EPSS exploit prediction

EPSS: 0.002 (6.7th percentile), scored 2026-10-23.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 6.7% 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

References

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

Frequently asked questions

What is CVE-2021-26397?: CVE-2021-26397 is a high-severity vulnerability in AMD 3rd Gen Epyc™. CVSS score: 7.1/10. Published 2023-05-09.
How severe is CVE-2021-26397?: High severity. CVSS v3 base score is 7.1 out of 10.