CVE-2021-26406

HIGH
7.5
CVSS Score
Published: May 9, 2023 at 06:59 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
89 products affected across 1 vendorEpyc 7402 FirmwareEpyc 7402P FirmwareEpyc 7542 Firmware

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Severity
HIGH7.5
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

Insufficient validation in parsing Owner's Certificate Authority (OCA) certificates in SEV (AMD Secure Encrypted Virtualization) and SEV-ES user application can lead to a host crash potentially resulting in denial of service.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

amd-epyc-7232p (same device)
amd-epyc-7251 (same device)
amd-epyc-7252 (same device)
amd-epyc-7261 (same device)
amd-epyc-7262 (same device)
amd-epyc-7272 (same device)
amd-epyc-7281 (same device)
amd-epyc-7282 (same device)
amd-epyc-7301 (same device)
amd-epyc-7302 (same device)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.5HIGHCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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