SolarWinds Serv-U 15.5.3 Multiple Vulnerabilities

critical Nessus Plugin ID 275612

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Synopsis

SolarWinds Serv-U is affected by a vulnerability

Description

The version of SolarWinds Serv-U installed on the remote host is prior to 15.5.3. It is, therefore, affected by multiple vulnerabilities as referenced in the solarwinds_serv-u_15_5_3 advisory.

- A Path Restriction Bypass vulnerability exists in Serv-U that when abused, could give a malicious actor with access to admin privileges the ability to execute code on a directory. This issue requires administrative privileges to abuse. On Windows systems, this scored as medium due to differences in how paths and home directories are handled. (CVE-2025-40549)

- A logic error vulnerability exists in Serv-U which when abused could give a malicious actor with access to admin privileges the ability to execute code. This issue requires administrative privileges to abuse. On Windows deployments, the risk is scored as a medium because services frequently run under less-privileged service accounts by default. (CVE-2025-40547)

- A missing validation process exists in Serv U when abused, could give a malicious actor with access to admin privileges the ability to execute code. This issue requires administrative privileges to abuse. On Windows deployments, the risk is scored as a medium because services frequently run under less-privileged service accounts by default. (CVE-2025-40548)

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 SolarWinds Serv-U version 15.5.3 or later.

Plugin Details

Severity: Critical

ID: 275612

File Name: solarwinds_solarwinds_serv-u_15_5_3.nasl

Version: 1.2

Type: remote

Family: FTP

Published: 11/18/2025

Updated: 11/21/2025

Configuration: Enable thorough checks (optional)

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: High

Score: 8.1

CVSS v2

Risk Factor: High

Base Score: 8.3

Temporal Score: 6.1

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

CVSS Score Source: CVE-2025-40549

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

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

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

Vulnerability Information

CPE: cpe:/a:solarwinds:serv-u, cpe:/a:serv-u:serv-u, cpe:/a:solarwinds:serv-u_file_server

Required KB Items: installed_sw/Serv-U

Exploit Ease: No known exploits are available

Patch Publication Date: 11/18/2025

Vulnerability Publication Date: 11/18/2025

Reference Information

CVE: CVE-2025-40547, CVE-2025-40548, CVE-2025-40549

IAVA: 2025-A-0873

Detections

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