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Fencer Vulns
high 7.8

CVE-2023-20555 json

Insufficient input validation in CpmDisplayFeatureSmm may allow an attacker to corrupt SMM memory by overwriting an arbitrary bit in an att…

published 2023-08-08 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-24734

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 25%
public exploits
0
none known

Summary

Insufficient input validation in CpmDisplayFeatureSmm may allow an attacker to corrupt SMM memory by overwriting an arbitrary bit in an attacker-controlled pointer potentially leading to arbitrary code execution in SMM.

Patch / fix

  • amd ryzen_3_3300_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_3_3300x_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_5_3600_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_5_3600x_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_7_3700_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_7_3700x_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_9_3800x_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_9_3850x_firmware comboam4_pi_v1_1.0.0.a, comboam4v2_pi_1.2.0.a
  • amd ryzen_9_5950x_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_9_5900x_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_9_5900_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_9_pro_5945_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_7_5800x3d_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_7_5800x_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_7_5800_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_7_5700x_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_7_pro_5845_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_5_5600x3d_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_5_5600x_firmware comboam4_v2_pi_1.2.0.a
  • amd ryzen_5_5600_firmware comboam4_v2_pi_1.2.0.a

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-20555 updated cvss 8.2

hw: AMD: SMM Memory Corruption Vulnerability

  • Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.32% chance of exploitation in the next 30 days, higher than 25% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

  • AMD Ryzen™ 3000 Series Desktop Processors “Matisse” AM4
  • AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4
  • AMD Ryzen™ 5000 Series Desktop Processor with Radeon™ Graphics “Cezanne” AM4
  • AMD Ryzen™ 7000 Series Processors “Raphael”
  • AMD Athlon™ 3000 Series Desktop Processors with Radeon™ Graphics “Picasso”
  • AMD Ryzen™ 4000 Series Desktop Processors with Radeon™ Graphics “Renoir” FP5
  • AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” FP5
  • AMD Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Pollock”
  • AMD Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Picasso”
  • AMD Ryzen™ 4000 Series Mobile Processors with Radeon™ Graphics “Renoir” FP6
  • AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne”
  • AMD Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Cezanne”
  • AMD Ryzen™ 6000 Series Mobile Processors "Rembrandt"
  • AMD Ryzen™ 7030 Series Mobile Processors “Barcelo”
  • AMD Ryzen™ 7020 Series Mobile Processors “Mendocino”
  • amd ryzen_3000_series_desktop_processors
  • amd ryzen_5000_series_desktop_processors
  • amd ryzen_7000_series_desktop_processors
  • amd athlon_3000g
  • amd ryzen_4000_series_desktop_processors_with_radeon_graphics

Classification

Weakness

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.