alert http any any -> $HOME_NET any (
msg:"ET WEB_SPECIFIC_APPS SolarWinds Web Help Desk Unauthenticated Remote Code Execution via Java Deserialization (CVE-2025-40551)";
flow:established,to_server;
http.uri;
content:"/helpdesk/WebObjects/Helpdesk.woa/wo/"; fast_pattern;
pcre:"/^[\d\.]+/R";
http.request_body;
content:"|22|java|2e|";
pcre:"/^[^\x22]*?(?:parentpopup|wonoselectionstring|dummy|mdssubmitlink|mdsform__enterkeypressed|mdsform__shiftkeypressed|mdsform__altkeypressed|_csrf)/R";
content:"|22|method|22 3a|";
content:"|22|wopage|2e|"; within:9;
reference:url,horizon3.ai/attack-research/cve-2025-40551-another-solarwinds-web-help-desk-deserialization-issue/;
reference:cve,2025-40551;
classtype:web-application-attack;
sid:2067189; rev:1;
metadata:affected_product SolarWinds, attack_target Server, tls_state TLSDecrypt, created_at 2026_01_29, cve CVE_2025_40551, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2026_01_29, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
target:dest_ip;
)