Detections
Analytics

Veeam Backup and Replication 12.x < 12.3.2.4465 Multiple Vulnerabilities (KB4830)

critical Nessus Plugin ID 309882

Synopsis

The version of Veeam Backup and Replication installed on the remote Windows host is affected by multiple vulnerabilities.

Description

The version of Veeam Backup and Replication installed on the remote Windows host is 12.x prior to 12.3.2.4465. It is, therefore, affected by multiple vulnerabilities, including:

 - A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
 (CVE-2026-21666)

 - A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server.
 (CVE-2026-21667)

 - A vulnerability allowing a Backup Viewer to perform remote code execution (RCE) as the postgres user.
 (CVE-2026-21708)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Upgrade to Veeam Backup and Replication version 12.3.2.4465 or later.

See Also

https://www.veeam.com/kb4830

Plugin Details

Severity: Critical

ID: 309882

File Name: veeam_backup_and_replication_kb4830.nasl

Version: 1.1

Type: Local

Agent: windows

Family: Windows

Published: 4/23/2026

Updated: 4/23/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.4

CVSS v2

Risk Factor: High

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS Score Source: CVE-2026-21666

CVSS v3

Risk Factor: Critical

Base Score: 9.9

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CVSS Score Source: CVE-2026-21708

Vulnerability Information

CPE: cpe:/a:veeam:backup_and_replication

Required KB Items: SMB/Registry/Enumerated, installed_sw/Veeam Backup and Replication

Patch Publication Date: 3/12/2026

Vulnerability Publication Date: 3/12/2026

Reference Information

CVE: CVE-2026-21666, CVE-2026-21667, CVE-2026-21668, CVE-2026-21672, CVE-2026-21708, CVE-2026-21709

IAVA: 2026-A-0244