CVE-2025-40551 — SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
Overview
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.
Vulnerability details
- CVE ID
- CVE-2025-40551
- Vulnerability
- SolarWinds Web Help Desk Deserialization of Untrusted Data Vulnerability
- Vendor
- SolarWinds
- Affected products
- SolarWinds: Web Help Desk
- Severity
- HIGH
- Exploitation status
- Actively exploited in the wild (CISA KEV)
- EPSS score
- 84.1% probability of exploitation in 30 days · 100th percentile
- Published
- 2026-02-03
Remediation guidance
CVE-2025-40551 is in CISA's Known Exploited Vulnerabilities (KEV) catalog — U.S. federal civilian agencies are required to remediate it under Binding Operational Directive 22-01. Treat it as a priority for every environment.
Apply the vendor's official security update for SolarWinds the affected product as soon as possible. Where a patch is unavailable, apply vendor mitigations or isolate/segment exposed systems.
FIRST EPSS estimates a 84.1% probability that CVE-2025-40551 will be exploited within the next 30 days (100th percentile of all CVEs) — useful for risk-based patch sequencing.
Hunt for indicators of compromise tied to this vulnerability and confirm logging/EDR coverage on affected assets.
Authoritative references
Remediate CVE-2025-40551 — and stay ahead of the next one
CVE-2025-40551 is listed in the CISA KEV catalog as actively exploited — treat remediation as urgent. Scan your domain free to see whether CVE-2025-40551 and other SolarWinds issues affect you and get a prioritized remediation report (full report from ₹999) — or stream the full feed of 1,600+ actively-exploited CVEs straight into your SOC.
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