Veeam Backup Replication
CVE-2026-21667
CRITICAL
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
AnalysisAI
A second RCE vulnerability in Veeam Backup & Replication allows any authenticated domain user to execute code on the Backup Server with scope change. Same impact as CVE-2026-21666 but through a different attack vector.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Valid domain user credentials required. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 9.9 (Critical). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with any domain user credentials exploits this second vector to achieve code execution on the Veeam server, even if the first vulnerability (CVE-2026-21666) has been specifically mitigated. |
| Remediation | Apply all Veeam patches addressing both CVE-2026-21666 and CVE-2026-21667. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Isolate the Backup Server from the network or restrict domain user access to emergency personnel only; audit recent backup server logs for suspicious activity. …
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External POC / Exploit Code
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