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Fencer Vulns
medium 5.5

CVE-2021-26371 json

A compromised or malicious ABL or UApp could send a SHA256 system call to the bootloader, which may result in exposure of ASP memory to use…

published 2023-05-09 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-13177

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

A compromised or malicious ABL or UApp could send a SHA256 system call to the bootloader, which may result in exposure of ASP memory to userspace, potentially leading to information disclosure.

Patch / fix

  • amd epyc_7773x_firmware milanpi_1.0.0.6
  • amd epyc_7763_firmware milanpi_1.0.0.6
  • amd epyc_7713p_firmware milanpi_1.0.0.6
  • amd epyc_7713_firmware milanpi_1.0.0.6
  • amd epyc_7663_firmware milanpi_1.0.0.6
  • amd epyc_7643_firmware milanpi_1.0.0.6
  • amd epyc_75f3_firmware milanpi_1.0.0.6
  • amd epyc_7573x_firmware milanpi_1.0.0.6
  • amd epyc_7543p_firmware milanpi_1.0.0.6
  • amd epyc_7543_firmware milanpi_1.0.0.6
  • amd epyc_7513_firmware milanpi_1.0.0.6
  • amd epyc_74f3_firmware milanpi_1.0.0.6
  • amd epyc_7473x_firmware milanpi_1.0.0.6
  • amd epyc_7453_firmware milanpi_1.0.0.6
  • amd epyc_7443p_firmware milanpi_1.0.0.6
  • amd epyc_7443_firmware milanpi_1.0.0.6
  • amd epyc_7413_firmware milanpi_1.0.0.6
  • amd epyc_73f3_firmware milanpi_1.0.0.6
  • amd epyc_7373x_firmware milanpi_1.0.0.6
  • amd epyc_7343_firmware milanpi_1.0.0.6

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% 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: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 Ryzen™ 2000 series Desktop Processors “Raven Ridge” AM4
  • AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4
  • AMD AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4
  • AMD 3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDT
  • AMD Ryzen™ Threadripper™ PRO Processors “Castle Peak” WS
  • AMD Ryzen™ Threadripper™ PRO Processors “Chagall” WS
  • AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” ULP
  • AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock”
  • AMD Ryzen™ 2000 Series Mobile Processors “Raven Ridge” FP5
  • AMD Ryzen™ 3000 Series Mobile processor, 2nd Gen AMD Ryzen™ Mobile Processors with Radeon™ Graphics “Picasso”
  • AMD 1st Gen AMD EPYC™ Processors
  • AMD 2nd Gen AMD EPYC™ Processors
  • AMD 3rd Gen AMD EPYC™ Processors

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.