CVE-2021-26371

Name: CVE-2021-26371
Creator: NVD / NIST
Published: 2023-05-09T19:15:10.82+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.5/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2021-26371 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. A compromised or malicious ABL or UApp could send a SHA256 system call to the bootloader, which may result in exposure of ASP memory to userspace, potentially leading to information disclosure. . EPSS estimates a 0.19% chance of exploitation in the next 30 days.

Description

A compromised or malicious ABL or UApp could send a SHA256 system call to the bootloader, which may result in exposure of ASP memory to userspace, potentially leading to information disclosure.

Metrics

CVSS 3.1

5.5/10

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

EPSS Probability

0.19%

8.7th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Amd	Epyc 7773x Firmware	< milanpi_1.0.0.6
Amd	Epyc 7763 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7713p Firmware	< milanpi_1.0.0.6
Amd	Epyc 7713 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7663 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7643 Firmware	< milanpi_1.0.0.6
Amd	Epyc 75f3 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7573x Firmware	< milanpi_1.0.0.6
Amd	Epyc 7543p Firmware	< milanpi_1.0.0.6
Amd	Epyc 7543 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7513 Firmware	< milanpi_1.0.0.6
Amd	Epyc 74f3 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7473x Firmware	< milanpi_1.0.0.6
Amd	Epyc 7453 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7443p Firmware	< milanpi_1.0.0.6
Amd	Epyc 7443 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7413 Firmware	< milanpi_1.0.0.6
Amd	Epyc 73f3 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7373x Firmware	< milanpi_1.0.0.6
Amd	Epyc 7343 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7313p Firmware	< milanpi_1.0.0.6
Amd	Epyc 7313 Firmware	< milanpi_1.0.0.6
Amd	Epyc 72f3 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7003 Firmware	< milanpi_1.0.0.6
Amd	Epyc 7002 Firmware	< romepi_1.0.0.d
Amd	Epyc 7232p Firmware	< romepi_1.0.0.d
Amd	Epyc 7252 Firmware	< romepi_1.0.0.d
Amd	Epyc 7262 Firmware	< romepi_1.0.0.d
Amd	Epyc 7272 Firmware	< romepi_1.0.0.d
Amd	Epyc 7282 Firmware	< romepi_1.0.0.d
Amd	Epyc 7302 Firmware	< romepi_1.0.0.d
Amd	Epyc 7302p Firmware	< romepi_1.0.0.d
Amd	Epyc 7352 Firmware	< romepi_1.0.0.d
Amd	Epyc 7402 Firmware	< romepi_1.0.0.d
Amd	Epyc 7402p Firmware	< romepi_1.0.0.d
Amd	Epyc 7452 Firmware	< romepi_1.0.0.d
Amd	Epyc 7502 Firmware	< romepi_1.0.0.d
Amd	Epyc 7502p Firmware	< romepi_1.0.0.d
Amd	Epyc 7532 Firmware	< romepi_1.0.0.d
Amd	Epyc 7542 Firmware	< romepi_1.0.0.d
Amd	Epyc 7552 Firmware	< romepi_1.0.0.d
Amd	Epyc 7642 Firmware	< romepi_1.0.0.d
Amd	Epyc 7662 Firmware	< romepi_1.0.0.d
Amd	Epyc 7702 Firmware	< romepi_1.0.0.d
Amd	Epyc 7702p Firmware	< romepi_1.0.0.d
Amd	Epyc 7742 Firmware	< romepi_1.0.0.d
Amd	Epyc 7f32 Firmware	< romepi_1.0.0.d
Amd	Epyc 7f52 Firmware	< romepi_1.0.0.d
Amd	Epyc 7f72 Firmware	< romepi_1.0.0.d
Amd	Epyc 7h12 Firmware	< romepi_1.0.0.d

Showing 50 of 128 affected configurations. See NVD for the full list.

References

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

Timeline

Published: May 9, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26371?

A compromised or malicious ABL or UApp could send a SHA256 system call to the bootloader, which may result in exposure of ASP memory to userspace, potentially leading to information disclosure.

How severe is CVE-2021-26371?

CVE-2021-26371 has a CVSS score of 5.5/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26371?

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-2021-26371?

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

Scan your code now

Source: NVD / NIST