CVE-2023-31355
Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to overwrite a guest's UMC seed potentially allowing reading of...
- Published
- Aug 5, 2024
- Updated
- Aug 6, 2024
- Assigning CNA
- AMD
- Evidence observed
- Aug 5, 2026
Primary CVSS
nvd · CVSS 3.1
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:NLow · next 30 days
- Percentile
- 37.8%
- Model date
- Sep 21, 2026
EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.
Summary
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.
Sources
1- cve-2023-31355-pocExploit
Exploit for AMD SEV-SNP firmware vulnerability (CVE-2023-31355) that decrypts arbitrary memory of decommissioned guests by corrupting the UMC key seed via an uninitialized RMP entry write to address zero.
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