CVE-2026-21666

CRITICAL
2026-03-12 [email protected]
9.9
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 19:57 vuln.today
CVE Published
Mar 12, 2026 - 15:16 nvd
CRITICAL 9.9

Tags

RCE Authentication Bypass

Description

A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.

Analysis

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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Remediation

Within 24 hours: Isolate the Backup Server from the domain and restrict network access to authorized administrators only; audit backup logs for suspicious activity. Within 7 days: Implement network segmentation to limit domain user access to the Backup Server; disable non-essential authentication methods; deploy enhanced monitoring on backup server processes. …

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Priority Score

50
Low Medium High Critical
KEV: 0
EPSS: +0.4
CVSS: +50
POC: 0

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CVE-2026-21666 vulnerability details – vuln.today
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