SolarWinds Web Help Desk RCE via Untrusted Deserialization (CVE-2025-40551)
CVE-2025-40551 Published on January 28, 2026

SolarWinds Web Help Desk Deserialization of Untrusted Data Remote Code Execution Vulnerability
SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.

Vendor Advisory NVD

Known Exploited Vulnerability

This SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. SolarWinds Web Help Desk contains a deserialization of untrusted data vulnerability that could lead to remote code execution, which would allow an attacker to run commands on the host machine. This could be exploited without authentication.

The following remediation steps are recommended / required by February 6, 2026: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vulnerability Analysis

CVE-2025-40551 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors in an automatable fashion. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
HIGH
Integrity Impact:
HIGH
Availability Impact:
HIGH

Weakness Type

What is a Marshaling, Unmarshaling Vulnerability?

The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

CVE-2025-40551 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.


Products Associated with CVE-2025-40551

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SolarWinds Web Help Desk
 

Affected Versions

SolarWinds Web Help Desk Version 12.8.8 HF1 and below is affected by CVE-2025-40551

Exploit Probability

EPSS
78.63%
Percentile
99.01%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.