ET WEB_SERVER SonicWall SMA Unauthenticated handleWAFRedirect CGI Arbitrary File Deletion (CVE-2021-20034)

SID: 2061721Rev: 117 views

Sourceet/open

CreatedApril 17, 2025

UpdatedApril 17, 2025

Classificationweb-application-attack

alert http any any -> $HOME_NET any (msg:"ET WEB_SERVER SonicWall SMA Unauthenticated handleWAFRedirect CGI Arbitrary File Deletion (CVE-2021-20034)"; flow:established,to_server; http.uri; content:"/cgi-bin/handleWAFRedirect|3f|"; fast_pattern; content:"hdl|3d|"; pcre:"/^[^&]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R"; reference:url,attackerkb.com/topics/23t9VCbGzt/cve-2021-20034/rapid7-analysis; reference:cve,2021-20034; classtype:web-application-attack; sid:2061721; rev:1; metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_17, cve CVE_2021_20034, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_17, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

References

url	attackerkb.com/topics/23t9VCbGzt/cve-2021-20034/rapid7-analysis
cve	2021-20034

Metadata

affected productSonicWall

attack targetServer

tls stateTLSDecrypt

created at2025_04_17

cveCVE-2021-20034

deploymentSSLDecrypt

confidenceHigh

signature severityMajor

tagExploit

updated at2025_04_17

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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