by Kastro
Paper/Archive/CVE-2026-21666

CVE-2026-21666

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

EPSS 1%CVSS 10.0
critical.is priorityof 100
44
CVSS 10.0 (CNA)10.0 / 10 × 3030.0Not in CISA KEV+300.0EPSS percentile 67.5.675 × 2013.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

Affected

ProductAffectedFixed inSource
Backup and Replication12.3.2 – < 12.3.212.3.2CNA

Scores by source

hackerone (CNA)10.0CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

refveeam.com/kb4830