Buy A Help Desk, Bundle A Remote Access Solution? (SolarWinds Web Help Desk Pre-Auth RCE Chain(s))
watchTowr Labs disclosed three new pre-authentication vulnerabilities in SolarWinds Web Help Desk (CVE-2025-40552, CVE-2025-40553, CVE-2025-40554) that chain together to achieve unauthenticated RCE on fully patched instances. The vulnerabilities exploit deserialization flaws in the legacy Java WebObjects framework and bypass existing security patches through encoding tricks and parser differential analysis. This represents the fourth major deserialization RCE chain in the product since 2024, with prior patches (CVE-2024-28986, CVE-2024-28988, CVE-2025-26399) all bypassed through similar mechanisms.