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Fencer Intel
critical 9.8

CVE-2021-26379 json

Insufficient input validation of mailbox data in the SMU may allow an attacker to coerce the SMU to corrupt SMRAM, potentially leading to a…

published 3y ago modified 4mo ago also EUVD-2021-13185

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

Insufficient input validation of mailbox data in the SMU may allow an attacker to coerce the SMU to corrupt SMRAM, potentially leading to a loss of integrity and privilege escalation.

Patch / fix

  • amd epyc_72f3_firmware milanpi_1.0.0.9
  • amd epyc_7313_firmware milanpi_1.0.0.9
  • amd epyc_7313p_firmware milanpi_1.0.0.9
  • amd epyc_7343_firmware milanpi_1.0.0.9
  • amd epyc_7373x_firmware milanpi_1.0.0.9
  • amd epyc_73f3_firmware milanpi_1.0.0.9
  • amd epyc_7413_firmware milanpi_1.0.0.9
  • amd epyc_7443_firmware milanpi_1.0.0.9
  • amd epyc_7443p_firmware milanpi_1.0.0.9
  • amd epyc_7453_firmware milanpi_1.0.0.9
  • amd epyc_7473x_firmware milanpi_1.0.0.9
  • amd epyc_74f3_firmware milanpi_1.0.0.9
  • amd epyc_7513_firmware milanpi_1.0.0.9
  • amd epyc_7543_firmware milanpi_1.0.0.9
  • amd epyc_7543p_firmware milanpi_1.0.0.9
  • amd epyc_7573x_firmware milanpi_1.0.0.9
  • amd epyc_75f3_firmware milanpi_1.0.0.9
  • amd epyc_7643_firmware milanpi_1.0.0.9
  • amd epyc_7663_firmware milanpi_1.0.0.9
  • amd epyc_7713_firmware milanpi_1.0.0.9

Is CVE-2021-26379 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
last yr.

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • AMD 2nd Gen AMD EPYC™
  • AMD 3rd Gen AMD EPYC™

References

Sources

Fencer Intel 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.