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CVE-2025-40551 is a critical deserialization of untrusted data vulnerability in SolarWinds Web Help Desk. The flaw affects Web Help Desk instances up to and including 12.8.8 HF1 and allows a remote attacker to supply untrusted serialized data that is processed by the application, resulting in arbitrary code execution on the underlying host. Available reporting characterizes the issue as exploitable without authentication and suitable for compromise of internet-exposed deployments. The vulnerability was fixed by SolarWinds in Web Help Desk version 2026.1.
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Patch, then assume compromise.
No valid public exploits. Mallory filtered out 2 candidates as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
152 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A specific vulnerability listed among the report's analyzed CVEs, but without further detail in the content.
A SolarWinds Web Help Desk vulnerability actively exploited to enable persistence, reconnaissance, and deployment of remote management tooling and Velociraptor C2.
A critical vulnerability in SolarWinds Web Help Desk (WHD) reported as being exploited by unknown attackers against internet-exposed instances, enabling initial access and subsequent lateral movement.
A critical vulnerability in SolarWinds Web Help Desk (WHD) reported as being exploited by unknown attackers; described as a 9.8-rated flaw and associated with intrusions against internet-exposed WHD instances.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.