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Veeam Backup Replication CVE-2026-21671

CRITICAL
Code Injection (CWE-94)
2026-03-12 support@hackerone.com
RCE Code Injection Veeam Backup Replication
9.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
9.1 CRITICAL
AV:N/AC:L/PR:H/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: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

DescriptionCVE.org

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.

AnalysisAI

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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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Authenticate as Backup Administrator
Exploit
Access HA deployment management interface
Execution
Inject malicious code via backup configuration parameter
Impact
Execute arbitrary code on HA replica node
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Vulnerability AssessmentAI

Exploitation Authenticated Backup Administrator role in Veeam Backup & Replication HA deployment. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment CVSS 9.1 (Critical). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario A Backup Administrator (or attacker who compromised admin credentials) exploits the HA communication channel to execute code on peer Veeam nodes, compromising the entire HA cluster.
Remediation Apply Veeam patches. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours: Inventory all Veeam Backup & Replication HA deployments and audit Backup Administrator role assignments, revoking unnecessary access. …

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

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CVE-2026-21671 vulnerability details – vuln.today
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