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Fencer Intel
medium 5.5

CVE-2021-26404 json

Improper input validation and bounds checking in SEV firmware may leak scratch buffer bytes leading to potential information disclosure.

published 3y ago modified 4mo ago also EUVD-2021-13210

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 8%
public exploits
0
none known

Summary

Improper input validation and bounds checking in SEV firmware may leak scratch buffer bytes leading to potential information disclosure.

Patch / fix

  • amd epyc_7003_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7313_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7313p_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7343_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7373x_firmware milanpi-sp3_1.0.0.9
  • amd epyc_73f3_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7413_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7443_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7443p_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7453_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7473x_firmware milanpi-sp3_1.0.0.9
  • amd epyc_74f3_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7513_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7543_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7543p_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7573x_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7643_firmware milanpi-sp3_1.0.0.9
  • amd epyc_75f3_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7663_firmware milanpi-sp3_1.0.0.9
  • amd epyc_7713_firmware milanpi-sp3_1.0.0.9

Is CVE-2021-26404 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
no
Technical impact
partial
Assessed
last yr.

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-09).

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:H/I:N/A:N
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CNA 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Affected products

  • AMD 3rd Gen EPYC

Classification

Weakness
  • CWE-20 Improper Input Validation

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.