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Vulnerability record · CVE-2021-26371 · published 9 May 2023

CVE-2021-26371: Amd epyc 7773x firmware vulnerability

AAmd · Epyc 7773x Firmware

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.

5.5 CVSS 3.1 Medium EPSS 0.19% · top 92.2%
5.5CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
128Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

128 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.4CVE-2021-26340Amd epyc 7001 firmware vulnerabilityA malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to flush the Translation Lookaside…EPSS 0.24%8.2CVE-2021-26344Amd epyc 7203 firmware out-of-bounds write vulnerabilityAn out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to modify the B…EPSS 0.16%8.2CVE-2021-26365Amd ryzen 5 2400g firmware out-of-bounds read vulnerabilityCertain size values in firmware binary headers could trigger out of bounds reads during signature validation, leading to denial of service or potenti…EPSS 0.57%7.8CVE-2021-26398Amd epyc 7h12 firmware out-of-bounds write vulnerabilityInsufficient input validation in SYS_KEY_DERIVE system call in a compromised user application or ABL may allow an attacker to corrupt ASP (AMD Secure…EPSS 0.21%7.8CVE-2021-26316Amd epyc 7h12 firmware improper input validation vulnerabilityFailure to validate the communication buffer and communication service in the BIOS may allow an attacker to tamper with the buffer resulting in poten…EPSS 0.26%7.8CVE-2021-26392Amd enterprise driver out-of-bounds write vulnerabilityInsufficient verification of missing size check in 'LoadModule' may lead to an out-of-bounds write potentially allowing an attacker with privileges t…EPSS 0.27%7.8CVE-2020-12931Amd enterprise driver vulnerabilityImproper parameters handling in the AMD Secure Processor (ASP) kernel may allow a privileged attacker to elevate their privileges potentially leading…EPSS 0.26%7.8CVE-2020-12930Amd enterprise driver vulnerabilityImproper parameters handling in AMD Secure Processor (ASP) drivers may allow a privileged attacker to elevate their privileges potentially leading to…EPSS 0.26%

Source: NIST National Vulnerability Database (record CVE-2021-26371), CISA KEV, FIRST EPSS (scores of 2026-10-02). This page is refreshed as NVD updates the record.