{"id":"CVE-2025-64394","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 privilege escalation or denial of service.","summary":"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.","severity":"medium","cvss":4.3,"cvssVector":"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","cvssSource":"cna","cwe":["CWE-1386"],"vendor":"Veeam","product":"Backup for Microsoft 365","affected":["backup_for_microsoft_365 >= 8.0 <= 8.6.0.1102"],"published":"2026-10-27","updated":"2026-10-27","sourceUpdated":"2026-10-27T16:16:58.979Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-64394","references":[{"url":"https://www.veeam.com/kb4957"}],"tags":["cve.org"],"ingestedAt":"2026-10-27T16:32:34.386Z","slug":"CVE-2025-64394","body":"## Overview\n\nA 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.\n\n## Affected\n\n- `backup_for_microsoft_365 >= 8.0 <= 8.6.0.1102`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}