CVE-2021-26406

CVE-2021-26406 is a high-severity vulnerability in Amd Epyc 7232p Firmware with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

• Severity: High (CVSS 3.x base score 7.5)
• EPSS exploit prediction: 0% (33rd percentile)
• Actively exploited: Not listed in CISA KEV
• Affected product: Amd Epyc 7232p Firmware
• Published: 2023-05-09
• Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-26406?

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.

How severe is CVE-2021-26406?

CVE-2021-26406 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-26406 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (33rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26406?

CVE-2021-26406 primarily affects Amd Epyc 7232p Firmware. In total, 40 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-26406?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-26406 published?

CVE-2021-26406 was published on 2023-05-09 and last updated on 2026-06-17.

References

• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-3001
• https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-4001

Affected products (40)

• cpe:2.3:o:amd:epyc_7232p_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7252_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7262_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7272_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7282_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7302_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7302p_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7352_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7402_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7402p_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7452_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7502_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7502p_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7532_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7542_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7552_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7642_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7662_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7702_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7702p_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7742_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7f32_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7f52_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7f72_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7h12_firmware:romepi_1.0.0.a:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7251_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7261_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7281_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7301_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7351_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7351p_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7371_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7401_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7401p_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7451_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7501_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7551_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7551p_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7571_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*
• cpe:2.3:o:amd:epyc_7601_firmware:naplespi_1.0.0.e:*:*:*:*:*:*:*

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