ET EXPLOIT Apache Log4j2 Issue #4255 FilteredObjectInputStream Allowlist Bypass via java.rmi.MarshalledObject

7.0.35.0SID: 2071820Rev: 1Enabled3 views
Sourceet/open
Fileemerging-exploit.rules
CreatedAugust 27, 2026
UpdatedAugust 27, 2026
Classificationattempted-user
alert tcp any any -> $HOME_NET any (msg:"ET EXPLOIT Apache Log4j2 Issue #4255 FilteredObjectInputStream Allowlist Bypass via java.rmi.MarshalledObject"; flow:established,to_server; content:"|ac ed 00 05|"; content:"|2e|impl|2e|Log4jLogEvent|24|LogEventProxy"; fast_pattern; distance:0; content:"java.rmi.MarshalledObject"; distance:0; content:"java.util.HashMap"; distance:0; content:"java.net.URL"; distance:0; reference:url,github.com/dinosn/log4j-4255; classtype:attempted-user; sid:2071820; rev:1; metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_08_27, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, updated_at 2026_08_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)

References

urlgithub.com/dinosn/log4j-4255

Metadata

attack targetServer
tls stateTLSDecrypt
created at2026_08_27
deploymentInternal
confidenceHigh
signature severityMajor
tagExploit
updated at2026_08_27
mitre tactic idTA0001
mitre tactic nameInitial_Access
mitre technique idT1190
mitre technique nameExploit_Public_Facing_Application

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