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Cyber Security Agency of Singapore
Alerts

Critical Vulnerability in Veeam Backup & Replication

9 October 2026

Attackers with the Backup Viewer role can exploit a critical vulnerability in Veeam Backup & Replication to execute arbitrary code as SYSTEM. Patch immediately.

Critical Vulnerability in Veeam Backup & Replication

Attackers with the Backup Viewer role can exploit a critical vulnerability in Veeam Backup & Replication to execute arbitrary code as SYSTEM. Patch immediately.

Background

Veeam has released security updates addressing a critical vulnerability (CVE-2025-64393) affecting Veeam Backup & Replication. This vulnerability has a Common Vulnerability Scoring System (CVSS v4.0) score of 9.4 out of 10.

Impact

Successful exploitation of this vulnerability could allow an attacker with the Backup Viewer role to perform remote code execution on the Veeam Backup Server through insecure deserialisation of untrusted data received via the Mount Service.

Affected Products

The vulnerability affects Veeam Backup & Replication versions 12 through 12.3.2.4854.

Recommendations

Users and administrators of affected products are advised to update to the latest versions immediately.

References

https://www.veeam.com/KB4934 (opens in new tab)

https://nvd.nist.gov/vuln/detail/CVE-2025-64393 (opens in new tab)