CVE-2025-64394 (GCVE-0-2025-64394)
Vulnerability from cvelistv5
Published
2026-10-27 16:16
Modified
2026-10-27 16:16
Severity ?
4.3 (Medium) - 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
CWE
  • CWE-1386 - Insecure Operation on Windows Junction / Mount Point
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.
References
Impacted products
Vendor Product Version
Veeam Backup for Microsoft 365 Version: 8.0   ≤ 8.6.0.1102
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Backup for Microsoft 365",
          "vendor": "Veeam",
          "versions": [
            {
              "lessThanOrEqual": "8.6.0.1102",
              "status": "affected",
              "version": "8.0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "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",
            "version": "4.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1386",
              "description": "CWE-1386 Insecure Operation on Windows Junction / Mount Point",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-27T16:16:58.979Z",
        "orgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
        "shortName": "hackerone"
      },
      "references": [
        {
          "url": "https://www.veeam.com/kb4957"
        }
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "36234546-b8fa-4601-9d6f-f4e334aa8ea1",
    "assignerShortName": "hackerone",
    "cveId": "CVE-2025-64394",
    "datePublished": "2026-10-27T16:16:58.979Z",
    "dateReserved": "2025-10-31T15:00:01.447Z",
    "dateUpdated": "2026-10-27T16:16:58.979Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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