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Fencer Vulns
medium 5.5

CVE-2021-26337 json

Insufficient DRAM address validation in System Management Unit (SMU) may result in a DMA read from invalid DRAM address to SRAM resulting i…

published 2021-11-16 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13143

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 15%
public exploits
0
none known

Summary

Insufficient DRAM address validation in System Management Unit (SMU) may result in a DMA read from invalid DRAM address to SRAM resulting in SMU not servicing further requests.

Patch / fix

  • amd epyc_7003_firmware milanpi-sp3_1.0.0.4
  • amd epyc_7002_firmware romepi-sp3_1.0.0.c
  • 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
  • amd epyc_7713p_firmware milanpi-sp3_1.0.0.4

Exploit prediction

0.24% chance of exploitation in the next 30 days, higher than 15% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:P/I:N/A:N

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.