CVE-2021-26344

An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow...

7.2 High

An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to modify the BIOS image, and the ability to sign the resulting image, to potentially modify the APCB block resulting in arbitrary code execution.

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: High
User interaction: Required

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

0.16%Up 0.1 points since Aug 14, 2024

What each source reports

CVE List Score used 7.2

Record: CVE-2021-26344
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

EUVDEUVD-2021-13150 7.2

Record: EUVD-2021-13150
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Updated: 2026-11-02

GitHub AdvisoriesGHSA-9h7f-r33v-rw4r 7.2

An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow...

Record: GHSA-9h7f-r33v-rw4r
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

NVD 7.2

Record: CVE-2021-26344
CVSS 3.1: 7.2 HighCVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H
CVSS 3.1: 8.2 HighCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Weakness: CWE-787
Updated: 2026-11-02

Affected products

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History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26344 is a high vulnerability (CVSS 7.2) in Amd Athlon™ 3000 Series Desktop Processors With Radeon™ Graphics, published August 13, 2024. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.16%, the 5th percentile. No source names a fixed version.