RCE in Veeam Backup & Replication HA Deployments

Successful exploitation allows remote code execution within a Veeam Backup & Replication high availability deployment. Because the required role is Backup Administrator, exploitation would let an attacker with that level of access run arbitrary code in the backup environment, creating risk to backup infrastructure and the sensitive organizational data it manages. This could plausibly enable compromise of backup services and facilitate follow-on actions against protected infrastructure, though the exact execution context is not specified in the provided content.

If immediate patching is not possible, reduce exposure by tightly restricting assignment and use of the Backup Administrator role, limiting access to HA deployment management interfaces, and monitoring for suspicious activity involving privileged backup accounts. Because Veeam warned that attackers may reverse-engineer patches to target unpatched systems, prioritizing rapid patch deployment is the primary mitigation. No product-specific workaround is provided in the available content.

Update Veeam Backup & Replication to a fixed release. The provided content states that Veeam Backup & Replication 13.0.1.2067 addresses CVE-2026-21671. Veeam also advised users to update their instances to the latest version to reduce risk.