{"id":"CVE-2023-31355","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-31355","generatedAt":"2026-10-28T02:15:09.692Z","title":"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.","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.","published":"2024-08-05T16:15:35.000Z","lastModified":"2026-06-17T05:56:50.000Z","status":"Analyzed","sourceIdentifier":"psirt@amd.com","cvss":{"version":"3.1","score":6,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:N"},"cwe":["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","amd/epyc 7573x firmware","amd/epyc 7643 firmware","amd/epyc 7773x firmware","amd/epyc 7643p firmware","amd/epyc 7663 firmware","amd/epyc 7663p firmware","amd/epyc 7713 firmware","amd/epyc 7713p firmware","amd/epyc 7763 firmware","amd/epyc 8024pn firmware","amd/epyc 8024p firmware","amd/epyc 8124pn firmware","amd/epyc 8124p firmware","amd/epyc 8224pn firmware","amd/epyc 8224p firmware","amd/epyc 8324pn firmware","amd/epyc 8324p firmware","amd/epyc 8434pn firmware","amd/epyc 8434p firmware","amd/epyc 8534pn firmware","amd/epyc 8534p firmware","amd/epyc 9734 firmware","amd/epyc 9754s firmware","amd/epyc 9754 firmware","amd/epyc 9184x firmware","amd/epyc 9384x firmware","amd/epyc 9684x firmware","amd/epyc 9124 firmware","amd/epyc 9174f firmware","amd/epyc 9224 firmware","amd/epyc 9254 firmware","amd/epyc 9274f firmware","amd/epyc 9334 firmware","amd/epyc 9354 firmware","amd/epyc 9354p firmware","amd/epyc 9374f firmware","amd/epyc 9454 firmware","amd/epyc 9454p firmware","amd/epyc 9474f firmware","amd/epyc 9534 firmware"],"epss":{"score":0.00443,"percentile":0.38282,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.44%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3011.html","tags":["Broken Link"],"source":"psirt@amd.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-31355","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}