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 memory from a decommissioned guest.
Does this matter?
Lower severity and a low EPSS score (0.44%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 6.0 MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N
- EPSS
- 0.44% probability · 38th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-119, CWE-787
- Affected
- amd/epyc 7203 firmware · amd/epyc 7203p firmware · amd/epyc 72f3 firmware · amd/epyc 7303 firmware · amd/epyc 7303p firmware · amd/epyc 7313 firmware · amd/epyc 7313p firmware · amd/epyc 7343 firmware · amd/epyc 73f3 firmware · amd/epyc 7373x firmware · amd/epyc 7413 firmware · amd/epyc 7443 firmware · amd/epyc 7443p firmware · amd/epyc 74f3 firmware · amd/epyc 7453 firmware · amd/epyc 7473x firmware · amd/epyc 7513 firmware · amd/epyc 7543 firmware · amd/epyc 7543p firmware · amd/epyc 75f3 firmware · +40 more
- Source
- psirt@amd.com
EPSS 0.4% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.