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How the CVE Works
CVE-2025-52434 is a race condition vulnerability in Apache Tomcat’s APR/Native connector, specifically affecting HTTP/2 connections. When a client abruptly closes an HTTP/2 connection, improper synchronization in shared resource handling can lead to concurrent execution flaws. This allows attackers to trigger unexpected behavior, such as crashes or potential remote code execution, by exploiting timing discrepancies in connection handling. The issue stems from insufficient thread safety mechanisms during connection termination, enabling malicious actors to manipulate the system state unpredictably.
DailyCVE Form
Platform: Apache Tomcat
Version: 9.0.0.M1 – 9.0.106
Vulnerability: Race Condition
Severity: Critical
Date: 07/29/2025
Prediction: Patch expected by 08/15/2025
What Undercode Say
curl -I http://vulnerable-tomcat:8080 gdb -p <tomcat_pid> watch -n 1 netstat -ano | grep 8080
How Exploit
1. Force-close HTTP/2 connections repeatedly.
2. Monitor thread contention via debug tools.
3. Trigger desynchronization for RCE.
Protection from this CVE
- Upgrade to Tomcat 9.0.107.
- Disable APR/Native connector if unused.
- Apply thread-safe connection handling patches.
Impact
- Remote Code Execution (RCE).
- Service disruption/crashes.
- Unauthorized data access.
Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
Undercode
