Veeam Backup Replication
CVE-2026-21666
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
Veeam Backup & Replication allows an authenticated domain user to achieve remote code execution on the Backup Server. With a scope change to CVSS 9.9, a compromised domain account can fully take over the backup infrastructure.
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Authenticated domain user account 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 | A ransomware operator compromises a domain user account, then exploits this vulnerability to execute code on the Veeam server. They delete all backup copies before deploying ransomware across the domain, eliminating recovery options. |
| Remediation | Apply Veeam security patches immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Isolate the Backup Server from the domain and restrict network access to authorized administrators only; audit backup logs for suspicious activity. …
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External POC / Exploit Code
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