What is CVE-2021-26402?

CVE-2021-26402 is a high-severity vulnerability in Amd 2nd Gen Epyc, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2023-01-11.

How severe is CVE-2021-26402?

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

Buffer overflow in Amd 2nd Gen Epyc

CVE-2021-26402

Insufficient bounds checking in ASP (AMD Secure Processor) firmware while handling BIOS mailbox commands, may allow an attacker to write partially-controlled data out-of-bounds to SMM or SEV-ES regions which may lead to a potential loss of…

Vulnerability class: Buffer Overflow

EPSS: 0.002 (7.7th percentile) — read the EPSS interpretation.

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.

Affected products

Amd 2nd Gen Epyc — versions Various
Amd 3rd Gen Epyc — versions various
Amd Epyc_7002
Amd Epyc_7002_firmware
Amd Epyc_7003
Amd Epyc_7003_firmware
Amd Epyc_7232p
Amd Epyc_7232p_firmware
Amd Epyc_7252
Amd Epyc_7252_firmware

Weakness classification (CWE)

CWE-787 — Out-of-bounds Write

References

psirt@amd.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-26402?: CVE-2021-26402 is a high-severity vulnerability in Amd 2nd Gen Epyc, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2023-01-11.
How severe is CVE-2021-26402?: High severity. CVSS v3 base score is 7.1 out of 10.