---
id: "CVE-2025-40551"
kind: "vulnerability"
aliases: ["CVE-2025-40551"]
title: "SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could\u2026"
severity: "critical"
cvss: 9.8
epss: null
exploited: true
status: "open"
category: "package"
products: [{"name": "solarwinds web help desk", "fixed": ["2026.1"], "affected": "< 2026.1", "ecosystem": "vendor"}, {"name": "SolarWinds Web Help Desk", "fixed": [], "affected": "", "ecosystem": "vendor"}]
ecosystems: ["vendor"]
tags: ["exploited", "package", "self-hosted", "solarwinds", "web-help-desk"]
not_affected_if: ["unknown"]
published_at: "2026-01-28T08:16:02+00:00"
first_seen_at: "2026-10-23T19:11:51+00:00"
updated_at: "2026-10-24T00:09:50+00:00"
sources: [{"source": "kev", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-40551", "first_seen_at": "2026-10-23T19:11:51+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40551", "first_seen_at": "2026-10-23T23:44:51+00:00"}]
---

# SolarWinds Web Help Desk was found to be susceptible to an untrusted data deserialization vulnerability that could…

SolarWinds Web Help Desk has an unsafe deserialization flaw that lets a remote user run commands on the host. The attacker needs no login, and CISA lists it as actively exploited.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:solarwinds web help desk affected < 2026.1 fixed 2026.1
- vendor:SolarWinds Web Help Desk affected ? fixed ?

## Fix

Apply the mitigations SolarWinds publishes for Web Help Desk, or stop using the product if no mitigation exists (per CISA KEV required action).

## Timeline

- 2026-10-23T19:11:51+00:00 kev https://www.cisa.gov/known-exploited-vulnerabilities-catalog?search_api_fulltext=CVE-2025-40551
- 2026-10-23T23:44:51+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-40551

## From the sources

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.

CISA 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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_