{"uuid": "08c1bcc5-abc2-4fd7-8a14-32dffe5c9afc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "name": "Vulnerabilities Resolved in Veeam Backup & Replication 12.3.2.4465", "description": "# KB4830: Vulnerabilities Resolved in Veeam Backup & Replication 12.3.2.4465\nVeeam Software Security Commitment\n\nVeeam\u00ae\u00a0is committed to ensuring its products protect customers from potential risks. As part of that commitment, we operate a\u00a0[Vulnerability Disclosure Program (VDP)](https://www.veeam.com/vulnerability-disclosure.html)\u00a0for 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\u2019s 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.\n\nIssue Details\n-------------\n\nAll vulnerabilities disclosed in this article affect **Veeam Backup & Replication\u00a012.3.2.4165**\u00a0and all\u00a0[earlier version 12 builds](https://www.veeam.com/kb2680).  \n\n#### **CVE-2026-21666**\n\nA vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.\n\n**Severity:**\u00a0Critical  \n**CVSS v3.1 Score:**\u00a09.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H  \n**Source:** Reported by\u00a0HackerOne.\n\n#### **CVE-2026-21667**\n\nA vulnerability allowing\u00a0an authenticated domain user to perform remote code execution (RCE) on the Backup Server.\n\n**Severity:**\u00a0Critical  \n**CVSS v3.1 Score:**\u00a09.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H  \n**Source:** Discovered during internal testing.\n\n#### **CVE-2026-21668**\n\nA vulnerability allowing\u00a0an authenticated domain user to bypass restrictions and manipulate arbitrary files on a Backup Repository.\n\n**Severity:**\u00a0High  \n**CVSS v3.1 Score:**\u00a08.8CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H  \n**Source:** Discovered during internal testing.\n\n#### **CVE-2026-21672**\n\nA vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.\n\n**Severity:**\u00a0High  \n**CVSS v3.1 Score:**\u00a08.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H  \n**Source:** Reported through HackerOne.\n\n#### **CVE-2026-21708**\n\nA vulnerability allowing\u00a0a Backup Viewer to perform remote code execution (RCE) as the `postgres` user.\n\n**Severity:**\u00a0Critical  \n**CVSS v3.1 Score:**\u00a09.9CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:L  \n**Source:** Discovered during internal testing.\n\n#### **Other Resolved Security-related Issues**\n\n*   Veeam Agent _for Linux_ \u2014 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.\n\nSolution\n--------\n\nIf this KB article did not resolve your issue or you need further assistance with Veeam software, please create a [Veeam Support Case.](https://www.veeam.com/kb1771)\n\nTo submit feedback regarding this article, please click this link: [Send Article Feedback](about:blank?ad=in-text-link#kb_request_form)  \nTo report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.", "creation_timestamp": "2026-03-13T11:02:43.907812+00:00", "timestamp": "2026-03-13T11:04:10.679301+00:00", "related_vulnerabilities": ["CVE-2026-21672", "CVE-2026-21668", "CVE-2026-21667", "CVE-2026-21708", "CVE-2026-21666"], "meta": [{"ref": ["https://www.veeam.com/kb4830"], "refs": ["https://www.veeam.com/kb4830"]}], "author": {"login": "adulau", "name": "Alexandre Dulaunoy", "uuid": "c933734a-9be8-4142-889e-26e95c752803"}}