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Fencer Vulns
high 7.9

CVE-2024-21980 json

Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a guest's memory or UM…

published 2024-08-05 2 y ago modified 2026-06-17 4 mo ago also EUVD-2024-19586

cvss
7.9
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 39%
public exploits
0
none known

Summary

Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a guest's memory or UMC seed resulting in loss of confidentiality and integrity.

Patch / fix

  • AMD 3rd Gen AMD EPYC™ Processors MilanPI 1.0.0.D
  • AMD 4th Gen AMD EPYC™ Processors GenoaPI 1.0.0.C
  • AMD AMD EPYC™ Embedded 7003 EmbMilanPI-SP3 1.0.0.9
  • AMD AMD EPYC™ Embedded 9003 EmbGenoaPI-SP5 1.0.0.7
  • amd epyc_7003_firmware milanpi_1.0.0.9_sp3
  • amd epyc_9003_firmware genoapi_1.0.0.7_sp5
  • amd epyc_7773x_firmware milanpi_1.0.0.d
  • amd epyc_9754s_firmware genoapi_1.0.0.c

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-2024-21980 updated cvss 7.9

kernel: hw:amd: Guest Memory Vulnerability in SNP

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present “Available mitigation requires to update BIOS (for updating firmware of CPU). The bug affects hardware (processors of AMD EPYC™ family).”

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

0.45% chance of exploitation in the next 30 days, higher than 39% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.9 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
NVD 3.1 7.9 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Affected products

  • AMD 3rd Gen AMD EPYC™ Processors
  • AMD 4th Gen AMD EPYC™ Processors
  • AMD AMD EPYC™ Embedded 7003
  • AMD AMD EPYC™ Embedded 9003
  • amd epyc_7003_firmware
  • amd epyc_9003_firmware
  • amd epyc_7773x_firmware
  • amd epyc_9754s_firmware

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
  • CWE-787 Out-of-bounds Write

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.