What is CVE-2026-21671?

CVE-2026-21671 is a critical-severity vulnerability in Veeam Software Appliance, classified under Code Injection. CVSS score: 9.1/10. Published 2026-03-12.

How severe is CVE-2026-21671?

Critical severity. CVSS v3 base score is 9.1 out of 10.

RCE in Veeam Software Appliance

CVE-2026-21671

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.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.002 (36.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Veeam Software Appliance — versions 13.0.1
Veeam Veeam_backup_\&_replication

Weakness classification (CWE)

CWE-94 — Code Injection
CWE-693 — Protection Mechanism Failure

References

support@hackerone.com (Vendor Advisory)

Frequently asked questions

What is CVE-2026-21671?: CVE-2026-21671 is a critical-severity vulnerability in Veeam Software Appliance, classified under Code Injection. CVSS score: 9.1/10. Published 2026-03-12.
How severe is CVE-2026-21671?: Critical severity. CVSS v3 base score is 9.1 out of 10.