CVE-2026-21671

CRITICAL
2026-03-12 [email protected]
9.1
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
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 9.1

Tags

RCE Code Injection

Description

A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication.

Analysis

Veeam Backup & Replication allows Backup Administrators to achieve RCE in high-availability deployments. While requiring admin-level access, the scope change to the HA infrastructure makes this critical for organizations running Veeam in HA mode.

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Remediation

Within 24 hours: Inventory all Veeam Backup & Replication HA deployments and audit Backup Administrator role assignments, revoking unnecessary access. Within 7 days: Implement network segmentation to restrict backup infrastructure access and enable enhanced logging on backup servers. …

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Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: +0.2
CVSS: +46
POC: 0

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CVE-2026-21671 vulnerability details – vuln.today
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