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Fencer Vulns
critical 9.8

CVE-2023-20596 json

Improper input validation in the SMM Supervisor may allow an attacker with a compromised SMI handler to gain Ring0 access potentially leadi…

published 2023-11-14 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-24775

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.0%
EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits
0
none known

Summary

Improper input validation in the SMM Supervisor may allow an attacker with a compromised SMI handler to gain Ring0 access potentially leading to arbitrary code execution.

Patch / fix

  • amd ryzen_7_5700g_firmware comboam4v2_1.2.0.b
  • amd ryzen_7_5700ge_firmware comboam4v2_1.2.0.b
  • amd ryzen_5_5600g_firmware comboam4v2_1.2.0.b
  • amd ryzen_5_5600ge_firmware comboam4v2_1.2.0.b
  • amd ryzen_3_5300g_firmware comboam4v2_1.2.0.b
  • amd ryzen_3_5300ge_firmware comboam4v2_1.2.0.b
  • amd ryzen_9_7950x3d_firmware comboam5pi_1.0.8.0
  • amd ryzen_9_7950x_firmware comboam5pi_1.0.8.0
  • amd ryzen_9_7900x3d_firmware comboam5pi_1.0.8.0
  • amd ryzen_9_7900_firmware comboam5pi_1.0.8.0
  • amd ryzen_9_7900x_firmware comboam5pi_1.0.8.0
  • amd ryzen_9_pro_7945_firmware comboam5pi_1.0.8.0
  • amd ryzen_7_7800x3d_firmware comboam5pi_1.0.8.0
  • amd ryzen_7_7700x_firmware comboam5pi_1.0.8.0
  • amd ryzen_7_7700_firmware comboam5pi_1.0.8.0
  • amd ryzen_7_pro_7745_firmware comboam5pi_1.0.8.0
  • amd ryzen_5_7600x_firmware comboam5pi_1.0.8.0
  • amd ryzen_5_7600_firmware comboam5pi_1.0.8.0
  • amd ryzen_5_pro_7645_firmware comboam5pi_1.0.8.0
  • amd ryzen_5_7500f_firmware comboam5pi_1.0.8.0

Exploit prediction

1.04% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics Formerly codenamed “Cezanne” AM4
  • AMD Ryzen™ 7000 Series Desktop Processors with Radeon™ Graphics Formerly codenamed “Raphael”
  • AMD Ryzen™ 7000 Series Desktop Processors with Radeon™ Graphics Formerly codenamed “Raphael” X3D
  • AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Cezanne”
  • AMD AMD Ryzen™ 6000 Series Processors with Radeon™ Graphics "Rembrandt"
  • AMD AMD Ryzen™ 7035 Series Processors with Radeon™ Graphics “Rembrandt-R”
  • AMD Ryzen™ 7040 Series Mobile Processors with Radeon™ Graphics Formerly codenamed “Phoenix”

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.