ET WEB_SPECIFIC_APPS SonicWall Email Security Authenticated Directory Traversal in Branding Feature (CVE-2021-20023)
Sourceet/open
CreatedSeptember 26, 2025
UpdatedSeptember 26, 2025
Classificationweb-application-attack
alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS SonicWall Email Security Authenticated Directory Traversal in Branding Feature (CVE-2021-20023)"; flow:established,to_server; http.uri; content:"/dload_apps|3f|"; fast_pattern; startswith; content:"action|3d|"; content:"path|3d|"; pcre:"/^[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R"; reference:url,cloud.google.com/blog/topics/threat-intelligence/zero-day-exploits-in-sonicwall-email-security-lead-to-compromise; reference:cve,2021-20023; classtype:web-application-attack; sid:2064936; rev:1; metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_09_26, cve CVE_2021_20023, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_26, 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 productSonicWall
attack targetServer
tls stateTLSDecrypt
created at2025_09_26
deploymentSSLDecrypt
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_09_26
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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