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Fencer Vulns
high 7.1

CVE-2023-20587 json

Improper Access Control in System Management Mode (SMM) may allow an attacker access to the SPI flash potentially leading to arbitrary code…

published 2024-02-13 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-24766

cvss
7.1
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 6%
public exploits
0
none known

Summary

Improper Access Control in System Management Mode (SMM) may allow an attacker access to the SPI flash potentially leading to arbitrary code execution.

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-2023-20587 updated cvss 8.4

hw: amd: failure to sanitize input in SMM

  • Red Hat Enterprise Linux 7 linux-firmware, iwl100-firmware, iwl105-firmware, iwl135-firmware, iwl1000-firmware, iwl2000-firmware, +12 more Red Hat Enterprise Linux 8 linux-firmware, iwl100-firmware, iwl105-firmware, iwl135-firmware, iwl1000-firmware, iwl2000-firmware, +15 more Red Hat Enterprise Linux 9 linux-firmware, iwl100-firmware, iwl105-firmware, iwl135-firmware, iwl1000-firmware, iwl2000-firmware, +11 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

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
CNA 3.1 7.1 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Affected products

  • AMD 3rd Gen AMD EPYC™ Processors
  • AMD 4th Gen AMD EPYC™ Processors
  • AMD 1st Gen AMD EPYC™ Processors
  • AMD 2nd Gen AMD EPYC™ Processors
  • AMD AMD EPYC(TM) Embedded 3000
  • AMD AMD EPYC(TM) Embedded 7002
  • AMD AMD EPYC(TM) Embedded 7003
  • AMD AMD EPYC(TM) Embedded 9003

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.