What is CVE-2021-26409?

CVE-2021-26409 is a high-severity vulnerability in Amd 3rd Gen Epyc, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2023-01-11.

How severe is CVE-2021-26409?

High severity. CVSS v3 base score is 7.8 out of 10.

Buffer overflow in Amd 3rd Gen Epyc

CVE-2021-26409

Insufficient bounds checking in SEV-ES may allow an attacker to corrupt Reverse Map table (RMP) memory, potentially resulting in a loss of SNP (Secure Nested Paging) memory integrity.

Vulnerability class: Buffer Overflow

EPSS: 0.002 (8.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Amd 3rd Gen Epyc — versions various
Amd Milanpi
Amd Milanpi_firmware

Weakness classification (CWE)

CWE-120 — Buffer Copy without Checking Size of Input (Classic Buffer Overflow)

References

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

Frequently asked questions

What is CVE-2021-26409?: CVE-2021-26409 is a high-severity vulnerability in Amd 3rd Gen Epyc, classified under Buffer Copy without Checking Size of Input (Classic Buffer Overflow). CVSS score: 7.8/10. Published 2023-01-11.
How severe is CVE-2021-26409?: High severity. CVSS v3 base score is 7.8 out of 10.