CVE-2025-40551

9.8

CRITICAL CVSS 3.1

SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability - [Actively Exploited]

Description

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.

INFO

Published Date :

Jan. 28, 2026, 8:16 a.m.

Last Modified :

Feb. 3, 2026, 9:13 p.m.

Remotely Exploit :

Yes !

Source :

[email protected]

CISA Notification

CISA KEV (Known Exploited Vulnerabilities)

For the benefit of the cybersecurity community and network defenders—and to help every organization better manage vulnerabilities and keep pace with threat activity—CISA maintains the authoritative source of vulnerabilities that have been exploited in the wild.

Due Date: Feb 06, 2026

Alert Date: Feb 03, 2026 | 17 days ago

Description :

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.

Required Action :

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Notes :

https://www.solarwinds.com/trust-center/security-advisories/cve-2025-40551 ; https://nvd.nist.gov/vuln/detail/CVE-2025-40551

Affected Products

The following products are affected by CVE-2025-40551 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID	Vendor	Product	Action
1	Solarwinds	web_help_desk

: Total Affected Vendor : 1 | Products : 1

CVSS Scores

The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.

Version	Severity	Source
CVSS 3.1	CRITICAL	49f11609-934d-4621-84e6-e02e032104d6
CVSS 3.1	CRITICAL	[email protected]
CVSS 3.1	CRITICAL	MITRE-CVE

Solution

Address untrusted data deserialization to prevent remote code execution. Update the software.

Update SolarWinds Web Help Desk to the latest version.
Apply vendor-provided security patches.
Review system logs for suspicious activity.
Restrict access to the affected system.

Public PoC/Exploit Available at Github

CVE-2025-40551 has a 2 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-40551.

URL	Resource
https://documentation.solarwinds.com/en/success_center/whd/content/release_notes/whd_2026-1_release_notes.htm	Release Notes
https://www.solarwinds.com/trust-center/security-advisories/CVE-2025-40551	Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2025-40551	US Government Resource

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-40551 is associated with the following CWEs:

CWE-502: Deserialization of Untrusted Data

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-40551 weaknesses.

CAPEC-586: Object Injection Object Injection

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Hunt3r850/CiberScan-Tool

Herramienta automatizada de ciberseguridad para escaneo de redes y detección de vulnerabilidades

Python Shell

Updated: 1 week, 5 days ago

0 stars 0 fork 0 watcher

Born at : June 6, 2025, 6:23 p.m. This repo has been linked 5 different CVEs too.

hsvhora/research_blogs

Links of research blogs published by me.

Updated: 1 week ago

0 stars 0 fork 0 watcher

Born at : April 16, 2025, 9:30 a.m. This repo has been linked 24 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-40551 vulnerability anywhere in the article.

The Hacker News

Researchers Observe In-the-Wild Exploitation of BeyondTrust CVSS 9.9 Vulnerability

Threat actors have started to exploit a recently disclosed critical security flaw impacting BeyondTrust Remote Support (RS) and Privileged Remote Access (PRA) products, according to watchTowr. "Overni ...

Published Date: Feb 13, 2026 (6 days, 16 hours ago)

Daily CyberSecurity

Virtual Invasion: SolarWinds WHD Exploited to Host Hidden QEMU VMs

Image: Microsoft In a striking display of “living off the land” gone wrong, threat actors are turning legitimate administrative tools into stealthy backdoors. The Microsoft Defender Research Team has ...

Published Date: Feb 10, 2026 (1 week, 3 days ago)

The Register

Someone's attacking SolarWinds WHD to steal high‑privilege credentials - but we don't know who or how

Digital intruders exploited buggy SolarWinds Web Help Desk (WHD) instances in December to break into victims' IT environments, move laterally, and steal high-privilege credentials, according to Micros ...

Published Date: Feb 09, 2026 (1 week, 3 days ago)

security.nl

Microsoft meldt aanvallen op SolarWinds Help Desk-installaties

Aanvallers hebben in december aanvallen uitgevoerd tegen SolarWinds Help Desk-installaties, zo meldt Microsoft. Welke kwetsbaarheden de aanvallers daarbij gebruikten is volgens het techbedrijf onduide ...

Published Date: Feb 09, 2026 (1 week, 3 days ago)

The Hacker News

SolarWinds Web Help Desk Exploited for RCE in Multi-Stage Attacks on Exposed Servers

Microsoft has revealed that it observed a multi‑stage intrusion that involved the threat actors exploiting internet‑exposed SolarWinds Web Help Desk (WHD) instances to obtain initial access and move l ...

Published Date: Feb 09, 2026 (1 week, 3 days ago)

CybersecurityNews

Hackers Actively Exploiting SolarWinds Web Help Desk RCE Vulnerability to Deploy Custom Tools

SolarWinds Vulnerability Actively Exploited Active exploitation of a remote code execution (RCE) vulnerability in SolarWinds Web Help Desk (WHD) is accelerating, with attackers rapidly weaponizing com ...

Published Date: Feb 09, 2026 (1 week, 3 days ago)

CybersecurityNews

Cybersecurity Weekly Newsletter – Notepad++ hack, Office 0-Day, ESXi 0-day Ransomware Attacks and More

Cybersecurity Newsletter Weekly February Welcome to this week’s pulse on the cyber threat landscape, where vulnerabilities strike fast, and defenders must move faster. Notepad++ users face a supply-ch ...

Published Date: Feb 08, 2026 (1 week, 4 days ago)

CybersecurityNews

170+ SolarWinds Help Desk Installations Vulnerable to RCE Attacks Exposed Online

SolarWinds Help Desk Installations Vulnerable Over 170 SolarWinds Web Help Desk installations remain vulnerable to a critical remote code execution (RCE) flaw that has been actively exploited in the w ...

Published Date: Feb 05, 2026 (2 weeks ago)

The Register

Critical SolarWinds Web Help Desk bug under attack

Attackers are exploiting a critical SolarWinds Web Help Desk bug - less than a week after the vendor disclosed and fixed the 9.8-rated flaw. That's according to America's lead cyber-defense agency, wh ...