What is the CVSS score of CVE-2026-21669?

CVE-2026-21669 has a CVSS 3.1 base score of 9.9 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of Veeam Backup Replication are affected by CVE-2026-21669?

A critical vulnerability (CVSS 9.9) in our Backup Server enables any authenticated domain user to execute arbitrary code remotely, potentially compromising all backed-up data and enabling lateral…

How to fix or mitigate CVE-2026-21669?

Within 24 hours: Isolate the Backup Server from the network or restrict access to essential administrators only; audit domain user access logs for suspicious activity; notify the vendor for emergency patch timeline. Within 7 days: Implement network segmentation to limit backup server access to specific admin workstations; enforce multi-factor authentication for all backup server administrative access; conduct forensic analysis of backup server logs. Within 30 days: Deploy compensating controls (listed below); establish continuous monitoring; develop and test incident response procedures specific to backup compromise scenarios.

Veeam Backup Replication CVE-2026-21669

CRITICAL

Code Injection (CWE-94)

2026-03-12 support@hackerone.com

RCE Code Injection Veeam Backup Replication

9.9

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.9 CRITICAL

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 19:57 vuln.today

CVE Published

Mar 12, 2026 - 15:16 nvd

CRITICAL 9.9

DescriptionCVE.org

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

AnalysisAI

Yet another Veeam Backup & Replication RCE vulnerability allowing authenticated domain users to execute code on the Backup Server with scope change (CVSS 9.9). Part of a cluster of related Veeam vulnerabilities disclosed together.

Technical ContextAI

Part of a series of access control failures in Veeam Backup & Replication that allow authenticated domain users to achieve code execution on the Backup Server. The scope change reflects OS-level compromise beyond the Veeam application.