CVE-2021-26387 json
Insufficient access controls in ASP kernel may allow a privileged attacker with access to AMD signing keys and the BIOS menu or UEFI shell…
published 2024-08-13 2 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13193
- cvss
- 3.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 3%
- public exploits
- 0
- none known
Summary
Insufficient access controls in ASP kernel may allow a privileged attacker with access to AMD signing keys and the BIOS menu or UEFI shell to map DRAM regions in protected areas, potentially leading to a loss of platform integrity.
Patch / fix
- AMD AMD Ryzen™ 3000 Series Desktop Processors ComboAM4 V2 PI 1.2.0.8, ComboAM4PI 1.0.0.9
- AMD AMD Ryzen™ 5000 Series Desktop Processors ComboAM4 V2 PI 1.2.0.8
- AMD AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics ComboAM4v2 PI 1.2.0.6
- AMD AMD Ryzen™ 7000 Series Desktop Processors ComboAM5 1.0.8.0
- AMD AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics ComboAM4PI 1.0.0.9, ComboAM4v2 PI 1.2.0.8
- AMD AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics ComboAM4v2 PI 1.2.0.5
- AMD AMD Ryzen™ Threadripper™ 3000 Series Processors CastlePeakPI-SP3r3 1.0.0.7
- AMD AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors CastlePeakWSPI-sWRX8 1.0.0.9, ChagallWSPI-sWRX8 1.0.0.2
- AMD AMD Ryzen™ Threadripper™ PRO 5000WX Processors ChagallWSPI-sWRX8 1.0.0.2
- AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics PicassoPI-FP5 1.0.0.E, PollockPI-FT5 1.0.0.4
- AMD AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics PicassoPI-FP5 1.0.0.E
- AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics RenoirPI-FP6 1.0.0.8
- AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics CezannePI-FP6 1.0.0.9, CezannePI-FP6 1.0.0.9
- AMD AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics RembrandtPI-FP7 1.0.0.9b
- AMD AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics RembrandtPI-FP7 1.0.0.9b
- AMD AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics CezannePI-FP6 1.0.0.9
- AMD AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics CezannePI-FP6 1.0.0.9
- AMD AMD Ryzen™ Embedded R1000 Series Processors EmbeddedPI-FP5 1.2.0.A
- AMD AMD Ryzen™ Embedded R2000 Series Processors EmbeddedR2KPI-FP5 1.0.0.2
- AMD AMD Ryzen™ Embedded 5000 Series Processors EmbAM4PI 1.0.0.2
- AMD AMD Ryzen™ Embedded V1000 Series Processors EmbeddedPI-FP5 1.2.0.A
- AMD AMD Ryzen™ Embedded V2000 Series Processors EmbeddedPI-FP6 1.0.0.6
- AMD AMD Ryzen™ Embedded V3000 Series Processors EmbeddedPI-FP7r2 1.0.0.9
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 2 y ago
Exploit prediction
0.15% chance of exploitation in the next 30 days, higher than 3% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 3.9 | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:L/A:L |
Affected products
- AMD AMD EPYC™ 7001 Series Processors
- AMD AMD EPYC™ 7002 Series Processors
- AMD AMD EPYC™ 7003 Series Processors
- AMD AMD EPYC™ 9004 Series Processors
- AMD AMD Ryzen™ 3000 Series Desktop Processors
- AMD AMD Ryzen™ 5000 Series Desktop Processors
- AMD AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics
- AMD AMD Ryzen™ 7000 Series Desktop Processors
- AMD AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics
- AMD AMD Ryzen™ Threadripper™ 3000 Series Processors
- AMD AMD Ryzen™ Threadripper™ PRO 3000WX Series Processors
- AMD AMD Ryzen™ Threadripper™ PRO 5000WX Processors
- AMD AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 3000 Series Mobile Processor with Radeon™ Graphics
- AMD AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 5000 Series Processors with Radeon™ Graphics
- AMD AMD Ryzen™ 3000 Series Processors with Radeon™ Graphics
- AMD AMD EPYC™ Embedded 3000 Series Processors
- AMD AMD EPYC™ Embedded 7002 Series Processors
- AMD AMD EPYC™ Embedded 7003 Series Processors
- AMD AMD EPYC™ Embedded 9003 Series Processors
- AMD AMD Ryzen™ Embedded R1000 Series Processors
- AMD AMD Ryzen™ Embedded R2000 Series Processors
- AMD AMD Ryzen™ Embedded 5000 Series Processors
- AMD AMD Ryzen™ Embedded V1000 Series Processors
- AMD AMD Ryzen™ Embedded V2000 Series Processors
- AMD AMD Ryzen™ Embedded V3000 Series Processors
Classification
- Weakness
-
- CWE-863 Incorrect Authorization
References
Sources
- CVE List CVE-2021-26387
- NVD CVE-2021-26387
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