CVE-2025-31651 PoC — Apache Tomcat: Bypass of rules in Rewrite Valve

Source

https://github.com/gregk4sec/CVE-2025-31651

Associated Vulnerability

Title: Apache Tomcat: Bypass of rules in Rewrite Valve (CVE-2025-31651)
Description:Improper Neutralization of Escape, Meta, or Control Sequences vulnerability in Apache Tomcat. For a subset of unlikely rewrite rule configurations, it was possible for a specially crafted request to bypass some rewrite rules. If those rewrite rules effectively enforced security constraints, those constraints could be bypassed. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.5, from 10.1.0-M1 through 10.1.39, from 9.0.0.M1 through 9.0.102. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 though 8.5.100. Other, older, EOL versions may also be affected. Users are recommended to upgrade to version [FIXED_VERSION], which fixes the issue.

Description

CVE Discovered by Greg K

Readme

# CVE-2025-31651
CVE Discovered by Greg K

## 0x01 Status
Privately, waiting for official disclosure

## 0x02 PoC

## 0x03 Finder
This cve is identified by [Greg K](https://github.com/gregk4sec)

File Snapshot

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