ET EXPLOIT Zyxel runCommandInShell Telnet Service Command Injection Attempt (CVE-2024-40891)
Sourceet/open
CreatedFebruary 24, 2025
UpdatedMarch 3, 2025
Classificationattempted-admin
alert tcp any any -> $HOME_NET 23 (msg:"ET EXPLOIT Zyxel runCommandInShell Telnet Service Command Injection Attempt (CVE-2024-40891)"; flow:established,to_server; pcre:"/^.*(?:cat|ifconfig|ping|ps|pwd|tftp|wlctl).*?(?:(?:\x3b|%3[Bb])|(?:\x0a|%0[Aa])|(?:\x60|%60)|(?:\x7c|%7[Cc])|(?:\x24|%24)|(?:\x26|%26))*?sh/"; content:"sh"; fast_pattern; reference:cve,2024-40891; reference:url,vulncheck.com/blog/zyxel-telnet-vulns; classtype:attempted-admin; sid:2060323; rev:2; metadata:affected_product Zyxel, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_02_24, cve CVE_2024_40891, deployment Perimeter, deployment Internal, performance_impact Moderate, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2025_03_03, 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 productZyxel
attack targetNetworking_Equipment
tls stateplaintext
created at2025_02_24
deploymentInternal
performance impactModerate
confidenceMedium
signature severityMajor
tagCISA_KEV
updated at2025_03_03
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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