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Fencer Vulns
high 7.5

CVE-2021-46755 json

Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious…

published 2023-05-09 3 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33411

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.6%
EPSS 0.6% chance of exploitation in 30 days, percentile 49%
public exploits
0
none known

Summary

Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious bootloader to exhaust the SysHub resources resulting in a potential denial of service.

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
21 mo ago

Exploit prediction

0.62% chance of exploitation in the next 30 days, higher than 49% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4
  • AMD AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4
  • AMD Ryzen™ 5000 Series Desktop processor with Radeon™ Graphics “Cezanne” 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 Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Renoir”
  • AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne”
  • AMD Ryzen™ 5000 Series Mobile processors with Radeon™ Graphics “Cezanne”

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.