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

criticalknown exploitedpublic exploitCVE-2025-40551
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: SolarWindsproduct: Web Help DeskRemote code execution
What
There is a deserialization of untrusted data vulnerability that could lead to remote code execution.
Who is affected
Deployments of SolarWinds Web Help Desk are affected.
Urgency
Remediation is urgent due to active exploitation and critical severity.
Action
Apply the latest security patch provided by SolarWinds.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-02-03
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2025-40551

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-40551coverage & exploitation statusNVD · CVE.org

Recent advisories for SolarWinds Web Help

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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