{"id":"CVE-2025-64394","state":"PUBLISHED","title":"A vulnerability allowing a low-privileged local user to write arbitrary files with SYSTEM privileges during the installation of Veeam Backup for Microsoft 365, which can lead to pr","description":"A vulnerability allowing a low-privileged local user to write arbitrary files with SYSTEM privileges during the installation of Veeam Backup for Microsoft 365, which can lead to privilege escalation or denial of service.","publishedAt":"2026-10-27T16:16:58.979Z","updatedAt":"2026-10-27T16:16:58.979Z","severity":{"score":4.3,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","source":"hackerone"},"assigner":"hackerone","products":["Veeam Backup for Microsoft 365"],"affected":[{"vendor":"Veeam","product":"Backup for Microsoft 365","defaultStatus":"unaffected","versions":[{"version":"8.0","status":"affected","lessThanOrEqual":"8.6.0.1102","versionType":"semver"}]}],"references":["https://www.veeam.com/kb4957"],"weaknesses":["CWE-1386"],"ingestedAt":"2026-10-29T20:09:48.677Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/64xxx/CVE-2025-64394.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-64394","state":"PUBLISHED","datePublished":"2026-10-27T16:16:58.979Z","dateUpdated":"2026-10-27T16:16:58.979Z","assignerShortName":"hackerone","assignerOrgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateReserved":"2025-10-31T15:00:01.447Z"},"containers":{"cna":{"descriptions":[{"lang":"en","value":"A vulnerability allowing a low-privileged local user to write arbitrary files with SYSTEM privileges during the installation of Veeam Backup for Microsoft 365, which can lead to privilege escalation or denial of service."}],"affected":[{"vendor":"Veeam","product":"Backup for Microsoft 365","defaultStatus":"unaffected","versions":[{"version":"8.0","status":"affected","lessThanOrEqual":"8.6.0.1102","versionType":"semver"}]}],"references":[{"url":"https://www.veeam.com/kb4957"}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N","baseScore":4.3,"baseSeverity":"MEDIUM"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-1386","type":"CWE","lang":"en","description":"CWE-1386 Insecure Operation on Windows Junction / Mount Point"}]}],"providerMetadata":{"shortName":"hackerone","orgId":"36234546-b8fa-4601-9d6f-f4e334aa8ea1","dateUpdated":"2026-10-27T16:16:58.979Z"}}}}}