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Veeam Backup and Replication < 13.0.1.2067 Multiple Vulnerabilities (March 2026) (KB4738)

medium Nessus Plugin ID 303202

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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 prior to 13.0.1.2067. It is, therefore, affected by multiple vulnerabilities:

 - A vulnerability allowing an authenticated domain user to perform remote code execution (RCE) on the Backup Server. (CVE-2026-21669)

 - A vulnerability allowing a low-privileged user to extract saved SSH credentials. (CVE-2026-21670)

 - A vulnerability allowing an authenticated user with the Backup Administrator role to perform remote code execution (RCE) in high availability (HA) deployments of Veeam Backup & Replication. (CVE-2026-21671)

 - A vulnerability allowing local privilege escalation on Windows-based Veeam Backup & Replication servers.
 (CVE-2026-21672)

 - 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 13.0.1.2067 or later.

See Also

https://www.veeam.com/kb4738

Plugin Details

Severity: Medium

ID: 303202

File Name: veeam_backup_and_replication_kb4738.nasl

Version: 1.3

Type: Local

Agent: windows

Family: Windows

Published: 3/20/2026

Updated: 3/31/2026

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.3

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 6.7

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

CVSS Score Source: CVE-2026-21669

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

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

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-21670

Vulnerability Information

CPE: cpe:/a:veeam:backup_and_replication

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

Exploit Ease: No known exploits are available

Patch Publication Date: 3/12/2026

Vulnerability Publication Date: 3/12/2026

Reference Information

CVE: CVE-2026-21669, CVE-2026-21670, CVE-2026-21671, CVE-2026-21672, CVE-2026-21708

IAVA: 2026-A-0244