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Vulnerabilities Resolved in Veeam Backup & Replication 12.3.2.4465

KB ID: 4830
Product: Veeam Backup & Replication | 12 | 12.1 | 12.2 | 12.3 | 12.3.1 | 12.3.2
Published: 2026-03-12
Last Modified: 2026-03-12
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All vulnerabilities documented in this article were resolved in Veeam Backup & Replication 12.3.2.4465.
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

All vulnerabilities disclosed in this article affect Veeam Backup & Replication 12.3.2.4165 and all earlier version 12 builds.

CVE-2026-21666

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

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 HackerOne.

CVE-2026-21667

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

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: Discovered during internal testing.

CVE-2026-21668

A vulnerability allowing an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.

Severity: High
CVSS v3.1 Score: 8.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: Discovered during internal testing.

CVE-2026-21672

A vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.

Severity: High
CVSS v3.1 Score: 8.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: Reported through HackerOne.

CVE-2026-21708

A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres 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:L
Source: Discovered during internal testing.

Other Resolved Security-related Issues

  • Veeam Agent for Linux — Updated the port range that the software will open in the machine's firewall to align with other Veeam products. Veeam Agent for Linux will now open ports 2500-3300.

Solution

These vulnerabilities were fixed starting with the following build:

If this KB article did not resolve your issue or you need further assistance with Veeam software, please create a Veeam Support Case.

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