ET WEB_SPECIFIC_APPS ASUS GT-AC2900 Authentication Bypass via Null Character in asus_token HTTP Cookie (CVE-2021-32030)

SID: 2064924Rev: 15 viewsHistory

Sourceet/open

CreatedSeptember 25, 2025

UpdatedSeptember 25, 2025

Classificationweb-application-attack

alert http any any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS ASUS GT-AC2900 Authentication Bypass via Null Character in asus_token HTTP Cookie (CVE-2021-32030)"; flow:established,to_server; http.uri; content:"/appGet.cgi|3f|"; startswith; content:"hook|3d|get_cfg_clientlist|28 29|"; fast_pattern; http.cookie; content:"asus_token|3d|"; pcre:"/^(?:\x00|\x2500|\x5c0)/R"; reference:url,www.atredis.com/blog/2021/4/30/asus-authentication-bypass; reference:cve,2021-32030; classtype:web-application-attack; sid:2064924; rev:1; metadata:affected_product Asus, created_at 2025_09_25, cve CVE_2021_32030, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_25, 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	www.atredis.com/blog/2021/4/30/asus-authentication-bypass
cve	2021-32030

Metadata

affected productAsus

created at2025_09_25

cveCVE-2021-32030

deploymentInternal

confidenceHigh

signature severityMajor

tagDescription_Generated_By_Proofpoint_Nexus

updated at2025_09_25

mitre tactic idTA0001

mitre tactic nameInitial_Access

mitre technique idT1190

mitre technique nameExploit_Public_Facing_Application

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