alert http any any -> $HOME_NET any (msg:"ET WEB_SERVER SonicWall SMA Heap-Based Buffer Overflow (CVE-2021-20043)"; flow:established,to_server; flowbits:isset,ET.SW.Bookmark; http.method; content:"POST"; http.uri; content:"/cgi-bin/sonicfiles|3f|"; fast_pattern; content:"RacNumber|3d|35"; reference:url,www.nccgroup.com/us/research-blog/technical-advisory-sonicwall-sma-100-series-heap-based-buffer-overflow-cve-2021-20043/; reference:cve,2021-20043; classtype:web-application-attack; sid:2061729; rev:1; metadata:affected_product SonicWall, attack_target Server, tls_state TLSDecrypt, created_at 2025_04_18, cve CVE_2021_20043, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_04_18, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)