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Medium severity6.5NVD Advisory· Published Jan 11, 2023· Updated Jun 17, 2026

CVE-2021-26403

CVE-2021-26403

Description

Insufficient checks in SEV may lead to a malicious hypervisor disclosing the launch secret potentially resulting in compromise of VM confidentiality.

Affected products

44
  • AMD/Epyc 7001 Firmware
    cpe:2.3:o:amd:epyc_7001_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7002 Firmware
    cpe:2.3:o:amd:epyc_7002_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7642 Firmware3 versions
    cpe:2.3:o:amd:epyc_7232p_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:amd:epyc_7232p_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7552_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7642_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
  • AMD/Epyc 7251 Firmware
    cpe:2.3:o:amd:epyc_7251_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7252 Firmware
    cpe:2.3:o:amd:epyc_7252_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7261 Firmware
    cpe:2.3:o:amd:epyc_7261_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7262 Firmware
    cpe:2.3:o:amd:epyc_7262_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7742 Firmware4 versions
    cpe:2.3:o:amd:epyc_7272_firmware:*:*:*:*:*:*:*:*+ 3 more
    • cpe:2.3:o:amd:epyc_7272_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7402p_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7702p_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7742_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
  • AMD/Epyc 7281 Firmware
    cpe:2.3:o:amd:epyc_7281_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7542 Firmware2 versions
    cpe:2.3:o:amd:epyc_7282_firmware:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:epyc_7282_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7542_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
  • AMD/Epyc 7301 Firmware
    cpe:2.3:o:amd:epyc_7301_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7302 Firmware2 versions
    cpe:2.3:o:amd:epyc_7302_firmware:*:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:epyc_7302_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7502p_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
  • AMD/Epyc 7302p Firmware
    cpe:2.3:o:amd:epyc_7302p_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7351 Firmware
    cpe:2.3:o:amd:epyc_7351_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7351p Firmware
    cpe:2.3:o:amd:epyc_7351p_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7352 Firmware
    cpe:2.3:o:amd:epyc_7352_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7371 Firmware
    cpe:2.3:o:amd:epyc_7371_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7401 Firmware
    cpe:2.3:o:amd:epyc_7401_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7401p Firmware
    cpe:2.3:o:amd:epyc_7401p_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7402 Firmware
    cpe:2.3:o:amd:epyc_7402_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7451 Firmware
    cpe:2.3:o:amd:epyc_7451_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7452 Firmware
    cpe:2.3:o:amd:epyc_7452_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7501 Firmware
    cpe:2.3:o:amd:epyc_7501_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7502 Firmware
    cpe:2.3:o:amd:epyc_7502_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7f32 Firmware3 versions
    cpe:2.3:o:amd:epyc_7532_firmware:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:amd:epyc_7532_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7f32_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
    • cpe:2.3:o:amd:epyc_7h12_firmware:*:*:*:*:*:*:*:*range: <romepi_1.0.0.9
  • AMD/Epyc 7551 Firmware
    cpe:2.3:o:amd:epyc_7551_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7551p Firmware
    cpe:2.3:o:amd:epyc_7551p_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7601 Firmware
    cpe:2.3:o:amd:epyc_7601_firmware:*:*:*:*:*:*:*:*
    Range: <naplespi_1.0.0.e
  • AMD/Epyc 7662 Firmware
    cpe:2.3:o:amd:epyc_7662_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7702 Firmware
    cpe:2.3:o:amd:epyc_7702_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7f52 Firmware
    cpe:2.3:o:amd:epyc_7f52_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/Epyc 7f72 Firmware
    cpe:2.3:o:amd:epyc_7f72_firmware:*:*:*:*:*:*:*:*
    Range: <romepi_1.0.0.9
  • AMD/SEVllm-fuzzy
  • AMD/1st Gen EPYCv5
    Range: various
  • AMD/2nd Gen EPYCv5
    Range: various

Patches

Vulnerability mechanics

References

1

News mentions

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