CVE-2021-26406
Insufficient validation in parsing Owner's Certificate Authority (OCA) certificates in SEV (AMD...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2021-26406- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
CVE List
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.
- Record
CVE-2021-26406- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
EUVDEUVD-2021-13212
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.
- Record
EUVD-2021-13212- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-03
GitHub AdvisoriesGHSA-r2pm-cwg9-cpwh
Insufficient validation in parsing Owner's Certificate Authority (OCA) certificates in SEV (AMD...
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.
- Record
GHSA-r2pm-cwg9-cpwh- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
- amd 1st gen amd epyc™ processors
- amd 2nd gen amd epyc™ processors
- amd 2nd gen amd ryzen™ threadripper™ processors “colfax”
- amd 3rd gen amd ryzen™ threadripper™ processors “castle peak” hedt
- amd ryzen™ 5000 series desktop processors “vermeer” am4
- amd athlon™ 3000 series mobile processors with radeon™ graphics “pollock”
- amd athlon™ 3000 series mobile processors with radeon™ graphics “dali”/”dali” ulp
- amd epyc 7232p firmware
- amd epyc 7251 firmware
- amd epyc 7252 firmware
- amd epyc 7261 firmware
- amd epyc 7262 firmware
Show 41 moreShow less
- amd epyc 7272 firmware
- amd epyc 7281 firmware
- amd epyc 7282 firmware
- amd epyc 7301 firmware
- amd epyc 7302 firmware
- amd epyc 7302p firmware
- amd epyc 7351 firmware
- amd epyc 7351p firmware
- amd epyc 7352 firmware
- amd epyc 7371 firmware
- amd epyc 7401 firmware
- amd epyc 7401p firmware
- amd epyc 7402 firmware
- amd epyc 7402p firmware
- amd epyc 7451 firmware
- amd epyc 7452 firmware
- amd epyc 7501 firmware
- amd epyc 7502 firmware
- amd epyc 7502p firmware
- amd epyc 7532 firmware
- amd epyc 7542 firmware
- amd epyc 7551 firmware
- amd epyc 7551p firmware
- amd epyc 7552 firmware
- amd epyc 7571 firmware
- amd epyc 7601 firmware
- amd epyc 7642 firmware
- amd epyc 7662 firmware
- amd epyc 7702 firmware
- amd epyc 7702p firmware
- amd epyc 7742 firmware
- amd epyc 7f32 firmware
- amd epyc 7f52 firmware
- amd epyc 7f72 firmware
- amd epyc 7h12 firmware
- amd ryzen™ 2000 series desktop processors “pinnacle ridge”
- amd ryzen™ 2000 series desktop processors “raven ridge” am4
- amd ryzen™ 2000 series mobile processors “raven ridge” fp5
- amd ryzen™ 3000 series desktop processors “matisse” am4
- amd ryzen™ 3000 series mobile processor, 2nd gen amd ryzen™ mobile processors with radeon™ graphics “picasso”
- amd ryzen™ threadripper™ pro processors “castle peak” ws
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases, published | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-26406 is a high vulnerability (CVSS 7.5) in Amd 1st Gen Amd Epyc™ Processors, published May 9, 2023. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.42%, the 36th percentile. No source names a fixed version.