ET HUNTING Sitecore Experience Platform ViewState Insecure Deserialization via Exposed ASP.NET MachineKeys (CVE-2025-53690)
Sourceet/open
CreatedSeptember 30, 2025
UpdatedSeptember 30, 2025
Classificationweb-application-attack
alert http any any -> $HOME_NET any (msg:"ET HUNTING Sitecore Experience Platform ViewState Insecure Deserialization via Exposed ASP.NET MachineKeys (CVE-2025-53690)"; flow:established,to_server; http.uri; content:"/sitecore/blocked.aspx"; fast_pattern; http.request_body; content:"__VIEWSTATE|3d|"; pcre:"/^([a-zA-Z0-9]*%2[BF]){50,}/R"; http.method; content:"POST"; reference:url,cloud.google.com/blog/topics/threat-intelligence/viewstate-deserialization-zero-day-vulnerability; reference:cve,2025-53690; classtype:web-application-attack; sid:2064998; rev:1; metadata:affected_product Sitecore, attack_target Server, tls_state TLSDecrypt, created_at 2025_09_30, cve CVE_2025_53690, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_30, 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 productSitecore
attack targetServer
tls stateTLSDecrypt
created at2025_09_30
deploymentSSLDecrypt
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_09_30
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application
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