Home/CVE/Insufficient validation in parsing Owner's Certificate Authority (OCA) certificates in SEV (AMD Secure Encrypted Virtual
CVE

CVE-2021-26406

Insufficient validation in parsing Owner's Certificate Authority (OCA) certificates in SEV (AMD Secure Encrypted Virtual

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.

HIGH · CVSS 7.5 EPSS 0.00445
Schedule remediation
  • SSVC automatable: yes - attacks can be scripted at scale
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
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Affected Products & Versions

40
amd epyc 7232p firmwareall versions
amd epyc 7252 firmwareall versions
amd epyc 7262 firmwareall versions
amd epyc 7272 firmwareall versions
amd epyc 7282 firmwareall versions
amd epyc 7302 firmwareall versions
amd epyc 7302p firmwareall versions
amd epyc 7352 firmwareall versions
▣

Scoring & Timeline

7.5
HIGH · CVSS v3.1 · psirt@amd.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD09 May 2023 · 07:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
yes
Technical impact
partial
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
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References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001Vendor Advisory
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