CVE-2021-26408

Name: CVE-2021-26408
Creator: NVD / NIST
Published: 2022-05-10T19:15:08.92+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.1/10EPSS 0.26%

Last modified Jun 17, 2026

CVE-2021-26408 is a high-severity vulnerability rated 7.1/10 on the CVSS scale. Insufficient validation of elliptic curve points in SEV-legacy firmware may compromise SEV-legacy guest migration potentially resulting in loss of guest's integrity or confidentiality.. EPSS estimates a 0.26% chance of exploitation in the next 30 days.

Description

Insufficient validation of elliptic curve points in SEV-legacy firmware may compromise SEV-legacy guest migration potentially resulting in loss of guest's integrity or confidentiality.

Metrics

CVSS 3.1

7.1/10

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

EPSS Probability

0.26%

17.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Amd	Epyc 7002 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7001 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7232p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7252 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7262 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7272 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7282 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7302 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7302p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7352 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7402 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7402p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7452 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7502 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7502p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7532 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7542 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7552 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7642 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7662 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7702 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7702p Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7742 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7f32 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7f52 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7f72 Firmware	< romepi-sp3_1.0.0.c
Amd	Epyc 7251 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7281 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7301 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7351 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7351p Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7401 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7401p Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7451 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7501 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7551 Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7551p Firmware	< naplespi-sp3_1.0.0.g
Amd	Epyc 7601 Firmware	< naplespi-sp3_1.0.0.g

References

https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021Vendor Advisory
https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1021Vendor Advisory

Timeline

Published: May 10, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26408?

Insufficient validation of elliptic curve points in SEV-legacy firmware may compromise SEV-legacy guest migration potentially resulting in loss of guest's integrity or confidentiality.

How severe is CVE-2021-26408?

CVE-2021-26408 has a CVSS score of 7.1/10 (HIGH severity). The EPSS model estimates a 0.26% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26408?

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-2021-26408?

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

Scan your code now

Source: NVD / NIST