KB4771: Vulnerabilities Resolved in Veeam Backup & Replication 12.3.2.4165 Patch

Veeam Software Security Commitment

Veeam® is committed to ensuring its products protect customers from potential risks. As part of that commitment, we operate a Vulnerability Disclosure Program (VDP) for all Veeam products and perform extensive internal code audits. When a vulnerability is identified, our team promptly develops a patch to address and mitigate the risk. In line with our dedication to transparency, we publicly disclose the vulnerability and provide detailed mitigation information. This approach ensures that all potentially affected customers can quickly implement the necessary measures to safeguard their systems. It’s important to note that once a vulnerability and its associated patch are disclosed, attackers will likely attempt to reverse-engineer the patch to exploit unpatched deployments of Veeam software. This reality underscores the critical importance of ensuring that all customers use the latest versions of our software and install all updates and patches without delay.

Issue Details

CVE-2025-48983

A vulnerability in the Mount service of Veeam Backup & Replication, which allows for remote code execution (RCE) on the Backup infrastructure hosts by an authenticated domain user.

Severity: Critical
CVSS v3.1 Score: 9.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: Reported by CODE WHITE.

Note: The Veeam Software Appliance and upcoming Veeam Backup & Replication v13 software for Microsoft Windows are architecturally not impacted by these types of vulnerabilities.

CVE-2025-48984

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

Severity: Critical
CVSS v3.1 Score: 9.9\>CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: Reported by Sina Kheirkhah (@SinSinology) and Piotr Bazydlo (@chudyPB) of watchTowr.

Note: The Veeam Software Appliance and upcoming Veeam Backup & Replication v13 software for Microsoft Windows are architecturally not impacted by these types of vulnerabilities.

CVE-2025-48982

This vulnerability in Veeam Agent for Microsoft Windows allows for Local Privilege Escalation if a system administrator is tricked into restoring a malicious file.

Severity: High
CVSS v3.1 Score: 7.3CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Source: Reported by an anonymous contributor working with the Trend Zero Day Initiative.

Affected Product

Veeam Agent for Microsoft Windows 6.3.2.1205 and all earlier version 6 builds.
Note: Unsupported product versions are not tested, but are likely affected and should be considered vulnerable.

Solution

This vulnerability was fixed starting in the following build:

• Veeam Agent for Microsoft Windows 6.3.2.1302
  Veeam Agent for Microsoft Windows is included with Veeam Backup & Replication and available as a standalone application.

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