CVE-2023-31355 | CVE Tracker

Description

Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allowing reading of memory from a decommissioned guest.

Scores

CVSS scores of CVE-2023-31355, by who scored it
Scored by	CVSS	Score	Vector
AMDCNA (assigner)	3.1	Medium6.0	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
NVDNVD · Analyzed	3.1	Medium6.0	CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N

EPSS (exploitation in 30 days): 0.44% · top 61% of all CVEs (6 Nov 2026)
CISA SSVC: Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 6.0.

Weakness

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer (opens in a new tab)All about CWE-119 and its CVEs
CWE-787 (opens in a new tab)All about CWE-787 and its CVEs

Affected products

AMD · 3rd Gen AMD EPYC™ Processors
- affected various – < MilanPI 1.0.0.D
AMD · 4th Gen AMD EPYC™ Processors
- affected various – < GenoaPI 1.0.0.C
AMD · AMD EPYC™ Embedded 7003
- affected various – < EmbMilanPI-SP3 1.0.0.9
AMD · AMD EPYC™ Embedded 9003
- affected various – < EmbGenoaPI-SP5 1.0.0.7

References (1)

https://https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3011.html (opens in a new tab)vendor-advisory

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated 6 Aug 2024, 14:58 UTC.

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