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Fencer Vulns
high 7.8

CVE-2021-26335 json

Improper input and range checking in the AMD Secure Processor (ASP) boot loader image header may allow an attacker to use attacker-controll…

published 2021-11-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13141

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

Improper input and range checking in the AMD Secure Processor (ASP) boot loader image header may allow an attacker to use attacker-controlled values prior to signature validation potentially resulting in arbitrary code execution.

Patch / fix

  • amd epyc_7003_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7002_firmware romepi-sp3_1.0.0.c
  • amd epyc_7001_firmware naplespi-sp3_1.0.0.g
  • amd epyc_72f3_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7313_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7313p_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7343_firmware milanpi-sp3_1.0.0.4
  • amd epyc_73f3_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7413_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7443_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7443p_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7453_firmware milanpi-sp3_1.0.0.4
  • amd epyc_74f3_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7513_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7543_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7543p_firmware milanpi-sp3_1.0.0.4
  • amd epyc_75f3_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7643_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7663_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7713_firmware milanpi-sp3_1.0.0.4

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Affected products

  • AMD Ryzen™ Series
  • AMD Athlon™ Series

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.