CVE-2025-52434

Apache Tomcat: APR/Native Connector crash leading to DoS

Published Jul 10, 2025 CVSS 3.1 · 7.5 High EPSS 2.1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Debian DLA Debian DLA DLA-4244-1 tomcat9 security update
EUVD EUVD EUVD-2025-21045 Apache Tomcat Utilities is vulnerable to resource exhaustion when using the APR/Native connector
Github GHSA Github GHSA GHSA-4j3c-42xv-3f84 Apache Tomcat is vulnerable to resource exhaustion when using the APR/Native connector
History
Type Values Removed Values Added
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. Older, EOL versions may also be affected. Users are recommended to upgrade to version 9.0.107, which fixes the issue. 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.
Type Values Removed Values Added
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. Users are recommended to upgrade to version 9.0.107, which fixes the issue. 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. Older, EOL versions may also be affected. Users are recommended to upgrade to version 9.0.107, which fixes the issue.
Type Values Removed Values Added
CPEs cpe:2.3:a:apache:tomcat:*:*:*:*:*:*:*:*
Type Values Removed Values Added
Metrics epss

{'score': 0.0006}

epss

{'score': 0.00078}

Type Values Removed Values Added
Metrics epss

{'score': 0.00018}

epss

{'score': 0.0006}

Type Values Removed Values Added
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

Type Values Removed Values Added
Metrics epss

{'score': 0.00018}

Type Values Removed Values Added
References
Metrics threat_severity

None

cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

epss

{}

threat_severity

Moderate

Type Values Removed Values Added
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. Users are recommended to upgrade to version 9.0.107, which fixes the issue.
Title Apache Tomcat: APR/Native Connector crash leading to DoS
Weaknesses CWE-362
References
Weaknesses

Sources

Status
PUBLISHED
Assigner
apache
Published
Updated
Nov 4, 2025, 9:11 PM
Reserved
Jun 16, 2025, 7:00 AM
Status
Modified
Published
Jul 10, 2025, 7:15 PM
Modified
Jun 17, 2026, 9:36 AM
Severity
Moderate
Public date
Jul 10, 2025, 7:03 PM