alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET EXPLOIT CHIYU IoT Devices - Denial of Service"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/if.cgi?redirect=AccLog.htm"; startswith; content:"&type=go_log_page&page=2781000"; endswith; fast_pattern; http.referer; content:"/AccLog.htm"; endswith; reference:cve,2021-31642; reference:url,www.exploit-db.com/exploits/49937; classtype:denial-of-service; sid:2033362; rev:2; metadata:affected_product IoT, attack_target Client_Endpoint, created_at 2021_07_19, cve CVE_2021_31642, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_19;)