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Vulnerability record · CVE-2021-26320 · published 16 November 2021

CVE-2021-26320: Amd epyc 7601 firmware improper certificate validation vulnerability

AAmd · Epyc 7601 Firmware

Insufficient validation of the AMD SEV Signing Key (ASK) in the SEND_START command in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP

5.5 CVSS 3.1 Medium EPSS 0.19% · top 92.4% CWE-295 · Improper certificate validation
5.5CVSS 3.1 base score, v2 2.1
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
57Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

Insufficient validation of the AMD SEV Signing Key (ASK) in the SEND_START command in the SEV Firmware may allow a local authenticated attacker to perform a denial of service of the PSP

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

57 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021 Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2021-26320), CISA KEV, FIRST EPSS (scores of 2026-10-12). This page is refreshed as NVD updates the record.