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

Added to the CISA Known Exploited Vulnerabilities catalog on 03 Feb 2026. Vendor: SolarWinds. Product: Web Help Desk.

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. (due 06 Feb 2026)