CVE-2021-26403

Name: CVE-2021-26403
Creator: NVD / NIST
Published: 2023-01-11T08:15:11.59+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.12%

Last modified Jun 17, 2026

CVE-2021-26403 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Insufficient checks in SEV may lead to a malicious hypervisor disclosing the launch secret potentially resulting in compromise of VM confidentiality. . EPSS estimates a 0.12% chance of exploitation in the next 30 days.

Description

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

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

EPSS Probability

0.12%

2.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-345

Affected Software

Vendor	Product	Versions
Amd	Epyc 7001 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7251 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7261 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7281 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7301 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7351 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7351p Firmware	< naplespi_1.0.0.e
Amd	Epyc 7371 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7401 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7401p Firmware	< naplespi_1.0.0.e
Amd	Epyc 7451 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7501 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7551 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7551p Firmware	< naplespi_1.0.0.e
Amd	Epyc 7601 Firmware	< naplespi_1.0.0.e
Amd	Epyc 7002 Firmware	< romepi_1.0.0.9
Amd	Epyc 7232p Firmware	< romepi_1.0.0.9
Amd	Epyc 7252 Firmware	< romepi_1.0.0.9
Amd	Epyc 7262 Firmware	< romepi_1.0.0.9
Amd	Epyc 7272 Firmware	< romepi_1.0.0.9
Amd	Epyc 7282 Firmware	< romepi_1.0.0.9
Amd	Epyc 7302 Firmware	< romepi_1.0.0.9
Amd	Epyc 7302p Firmware	< romepi_1.0.0.9
Amd	Epyc 7352 Firmware	< romepi_1.0.0.9
Amd	Epyc 7402 Firmware	< romepi_1.0.0.9
Amd	Epyc 7402p Firmware	< romepi_1.0.0.9
Amd	Epyc 7452 Firmware	< romepi_1.0.0.9
Amd	Epyc 7502 Firmware	< romepi_1.0.0.9
Amd	Epyc 7502p Firmware	< romepi_1.0.0.9
Amd	Epyc 7532 Firmware	< romepi_1.0.0.9
Amd	Epyc 7542 Firmware	< romepi_1.0.0.9
Amd	Epyc 7552 Firmware	< romepi_1.0.0.9
Amd	Epyc 7642 Firmware	< romepi_1.0.0.9
Amd	Epyc 7662 Firmware	< romepi_1.0.0.9
Amd	Epyc 7702 Firmware	< romepi_1.0.0.9
Amd	Epyc 7702p Firmware	< romepi_1.0.0.9
Amd	Epyc 7742 Firmware	< romepi_1.0.0.9
Amd	Epyc 7f32 Firmware	< romepi_1.0.0.9
Amd	Epyc 7f52 Firmware	< romepi_1.0.0.9
Amd	Epyc 7f72 Firmware	< romepi_1.0.0.9
Amd	Epyc 7h12 Firmware	< romepi_1.0.0.9

References

https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/AMD-SB-1032Vendor Advisory

Timeline

Published: Jan 11, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26403?

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

How severe is CVE-2021-26403?

CVE-2021-26403 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.12% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26403?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26403?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST