Apache Tomcat APR/Native Race Condition CVE-2025-52434 Fixed 9.0.107
CVE-2025-52434 Published on July 10, 2025

Apache Tomcat: APR/Native Connector crash leading to DoS
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector. This was particularly noticeable with client initiated closes of HTTP/2 connections. This issue affects Apache Tomcat: from 9.0.0.M1 through 9.0.106. The following versions were EOL at the time the CVE was created but are known to be affected: 8.5.0 through 8.5.100. Other, older, EOL versions may also be affected. Users are recommended to upgrade to version 9.0.107, which fixes the issue.

Vendor Advisory NVD

Vulnerability Analysis

CVE-2025-52434 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.

Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Weakness Type

What is a Race Condition Vulnerability?

The program contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently.

CVE-2025-52434 has been classified to as a Race Condition vulnerability or weakness.


Products Associated with CVE-2025-52434

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2025-52434 are published in these products:

Apache Tomcat
 
F5 Networks Tomcat
 
Oracle
 

Affected Versions

Apache Software Foundation Apache Tomcat:

Exploit Probability

EPSS
0.20%
Percentile
41.78%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.