ET WEB_SPECIFIC_APPS Zoho ManageEngine ServiceDesk Plus Custom Schedules Arbitrary Command Execution (CVE-2021-20081)
Sourceet/open
CreatedDecember 9, 2025
UpdatedDecember 9, 2025
Classificationweb-application-attack
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Zoho ManageEngine ServiceDesk Plus Custom Schedules Arbitrary Command Execution (CVE-2021-20081)"; flow:established,to_server; http.uri; content:"/api/v3/custom_schedules"; fast_pattern; http.request_body; content:"executor_type"; content:"script"; within:20; reference:url,www.tenable.com/security/research/tra-2021-22; reference:cve,2021-20081; classtype:web-application-attack; sid:2066202; rev:1; metadata:affected_product Zoho_ManageEngine, attack_target Server, tls_state TLSDecrypt, created_at 2025_12_09, cve CVE_2021_20081, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_12_09, 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 productZoho_ManageEngine
attack targetServer
tls stateTLSDecrypt
created at2025_12_09
deploymentSSLDecrypt
confidenceHigh
signature severityMajor
tagExploit
updated at2025_12_09
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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