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.
Technical ContextAI
Similar to CVE-2026-21666, improper access controls (CWE-284) allow a low-privileged domain user to execute arbitrary code on the Veeam Backup Server with scope change. This represents a separate code path but the same fundamental access control failure.
RemediationAI
Apply all Veeam patches addressing both CVE-2026-21666 and CVE-2026-21667. These should be treated as a single remediation effort.
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Same weakness CWE-284 – Improper Access Control
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External POC / Exploit Code
Leaving vuln.today