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.

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access

Authenticate as domain user

Exploit

Send malicious request to Backup Server

Execution

Trigger code injection via CWE-94 mechanism

Impact

Execute arbitrary code with server privileges

Access

Authenticate as domain user

Exploit

Send malicious request to Backup Server

Execution

Trigger code injection via CWE-94 mechanism

Impact

Execute arbitrary code with server privileges

Vulnerability AssessmentAI

Exploitation	Valid domain user credentials 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	An attacker chains domain user access with any of the three Veeam RCE vulnerabilities to compromise backup infrastructure. Multiple attack paths increase the likelihood of successful exploitation.
Remediation	Apply all Veeam security updates addressing the full cluster of RCE vulnerabilities. … Detailed patch versions, workarounds, and compensating controls in full report.

Recommended ActionAI

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. …

Threat intelligence, references, and detailed analysis are available after sign-in.

CVE-2026-21669 vulnerability details – vuln.today

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Veeam Backup Replication CVE-2026-21669

Severity by source

CVSS VectorNVD

Lifecycle Timeline

DescriptionCVE.org

AnalysisAI

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Attack ChainAIDerived

Vulnerability AssessmentAI

Recommended ActionAI

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External POC / Exploit Code