Vulnerability in Veeam Backup And Replication

CVE-2026-21666

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

EPSS: 0.004 (61.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

Affected products

Veeam Backup And Replication — versions 12.3.2

References

www.veeam.com/kb4830

Frequently asked questions

What is CVE-2026-21666?: CVE-2026-21666 is a critical-severity vulnerability in Veeam Backup And Replication. CVSS score: 10.0/10. Published 2026-03-12.
How severe is CVE-2026-21666?: Critical severity. CVSS v3 base score is 10.0 out of 10.