Untrusted Data Deserialization Vulnerability in SolarWinds Web Help Desk
CVE-2025-40551

9.8CRITICAL

Key Information:

Vendor: Solarwinds
Status: Web Help Desk
Vendor: CVE Published:; 28 January 2026

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💰 Ransomware👾 Exploit Exists🟣 EPSS 78%🦅 CISA Reported📰 News Worthy

What is CVE-2025-40551?

SolarWinds Web Help Desk is vulnerable to an untrusted data deserialization flaw that could permit remote code execution. This weakness can be exploited by attackers to execute arbitrary commands on the affected host without requiring authentication, leading to significant security risks for organizations using this software. It is crucial for users to apply security patches and updates to safeguard their systems from potential attacks.

CISA has reported CVE-2025-40551

CISA provides regional cyber and physical services to support security and resilience across the United States. CISA monitor the most dangerious vulnerabilities and have identifed CVE-2025-40551 as being exploited but is not known by the CISA to be used in ransomware campaigns. This is subject to change at pace as recent news articles suggest the vulnerability is being used by ransomware groups.

The CISA's recommendation is: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

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