ET WEB_SPECIFIC_APPS LibreNMS WHOIS query Parameter Command Injection Attempt (CVE-2026-6204)
Sourceet/open
CreatedApril 20, 2026
UpdatedApril 20, 2026
Classificationattempted-admin
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS LibreNMS WHOIS query Parameter Command Injection Attempt (CVE-2026-6204)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ajax/netcmd|3f|cmd|3d|whois|26|query|3d|"; fast_pattern; reference:url,projectblack.io/blog/librenms-authenticated-rce-and-xss/#binary-path-rce-poc; reference:cve,2026-6204; classtype:attempted-admin; sid:2068848; rev:1; metadata:affected_product LibreNMS, attack_target Web_Server, tls_state TLSDecrypt, created_at 2026_04_20, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Unknown, tag Exploit, updated_at 2026_04_20, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)
References
Metadata
affected productLibreNMS
attack targetWeb_Server
tls stateTLSDecrypt
created at2026_04_20
deploymentSSLDecrypt
performance impactLow
confidenceHigh
signature severityUnknown
tagExploit
updated at2026_04_20
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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