Malicious Tomcat Partial PUT of Session File via Content-Range Header

ATT&CK techniques

Initial Access

Recon
Resource Dev
Initial Access
- T1190Exploit Public-Facing Application
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects HTTP PUT requests targeting a .session file while carrying a Content-Range header, the upload step of the Tomcat CVE-2025-24813 partial-PUT deserialization exploit. Attackers write a serialized Java session file that is later deserialized for remote code execution. This upload pattern is a strong pre-exploitation indicator.

Reporting behind it

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Malicious Tomcat Partial PUT of Session File via Content-Range Header

Pivot detection · T1190 · 9 related

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