CVE-2021-26344
An out of bounds memory write when processing the AMD PSP1 Configuration Block (APCB) could allow an attacker with access the ability to…
- Published
- Updated
- Reserved
- Assigned by
- AMD
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| AMDCNA (assigner) | 3.1 | High7.2 | CVSS:3.1/AV:L/AC:H/PR:H/UI:R/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.16% · top 95% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.2.
Weakness
Affected products
AMD · AMD EPYC™ 7001 Series Processors
- affected various
AMD · AMD EPYC™ 7002 Series Processors
- unaffected RomePI 1.0.0.C
AMD · AMD EPYC™ 7003 Series Processors
- unaffected MilanPI 1.0.0.5
AMD · AMD Ryzen™ 3000 Series Desktop Processors
- affected various
AMD · AMD Ryzen™ 5000 Series Desktop Processors
- unaffected ComboAM4V2 1.2.0.A
AMD · AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics
- unaffected ComboAM4V2 1.2.0.A
AMD · AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics
- affected various
AMD · AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics
- affected various
AMD · AMD Ryzen™ Threadripper™ 3000 Series Processors
- affected various
AMD · AMD Ryzen™ Threadripper™ PRO 5000WX Processors
- unaffected ChagallWSPI-sWRX8 1.0.0.6
AMD · AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics
- affected various
AMD · AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics
- affected various
AMD · AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics
- affected various
AMD · AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics
- affected various
AMD · AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics
- affected various
AMD · AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics
- unaffected CezannePI-FP6 1.0.0.E
AMD · AMD Ryzen™ 7020 Series Processors with Radeon™ Graphics
- unaffected MendocinoPI-FT6 1.0.0.3
AMD · AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics
- unaffected RembrandtPI-FP7 1.0.0.7
AMD · AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics
- unaffected RembrandtPI-FP7 1.0.0.7
AMD · AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics
- unaffected CezannePI-FP6 1.0.0.E
AMD · AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics
- unaffected CezannePI-FP6 1.0.0.E
AMD · AMD EPYC™ Embedded 7002 Series Processors
- unaffected EmbRomePI-SP3 1.0.0.6
AMD · AMD EPYC™ Embedded 3000 Series Processors
- affected Various
AMD · AMD EPYC™ Embedded 7003 Series Processors
- unaffected EmbMilanPI-SP3 1.0.0.2
AMD · AMD Ryzen™ Embedded R1000 Series Processors
- affected v
AMD · AMD Ryzen™ Embedded R2000 Series Processors
- affected v
AMD · AMD Ryzen™ Embedded 5000 Series Processors
- affected v
AMD · AMD Ryzen™ Embedded V1000 Series Processors
- affected v
AMD · AMD Ryzen™ Embedded V2000 Series Processors
- affected v
AMD · AMD Ryzen™ Embedded V3000 Series Processors
- unaffected EmbeddedPI-FP7r2 1.0.0.4
References (1)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-26344)Record last updated .