What’s Vulnerable › Vulnerabilities

CVE-2025-52434: Apache Tomcat: APR/Native Connector crash leading to DoS

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-07-10 · updated 2026-06-17
• Weakness: CWE-362

Description

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.

Affected products

• Apache Tomcat: from 9.0.0 before 9.0.107 — fixed in 9.0.107

How to fix

Upgrade to a fixed version: Apache Tomcat 9.0.107. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
• http://www.openwall.com/lists/oss-security/2025/07/10/11
• https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html

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