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Fencer Vulns
medium 5.5

CVE-2021-26355 json

Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in…

published 2023-01-10 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13161

cvss
5.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 7%
public exploits
0
none known

Summary

Insufficient fencing and checks in System Management Unit (SMU) may result in access to invalid message port registers that could result in a potential denial-of-service.

Patch / fix

  • amd epyc_7003_firmware milanpi-sp3_1.0.0.7
  • amd epyc_72f3_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7313_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7313p_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7343_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7373x_firmware milanpi-sp3_1.0.0.7
  • amd epyc_73f3_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7413_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7443_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7443p_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7453_firmware milanpi-sp3_1.0.0.7
  • amd epyc_74f3_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7513_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7543_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7543p_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7573x_firmware milanpi-sp3_1.0.0.7
  • amd epyc_75f3_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7643_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7663_firmware milanpi-sp3_1.0.0.7
  • amd epyc_7713_firmware milanpi-sp3_1.0.0.7

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
19 mo ago

Exploit prediction

0.18% chance of exploitation in the next 30 days, higher than 7% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products

  • AMD 3rd Gen EPYC

Classification

Weakness
  • CWE-693 Protection Mechanism Failure

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.