VulnerabilityModified

CVE-2025-52434

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector.

HIGH 7.5EPSS 1.91%

Does this matter?

High impact if exploited, but EPSS currently rates exploitation as unlikely (1.91%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.

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.

CVSS 3.1: 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 1.91% probability · 79th percentile
CISA KEV: Not listed
Weakness: CWE-362
Affected: apache/tomcat
Source: security@apache.org

References

https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030Issue Tracking, Mailing List, Vendor Advisory
http://www.openwall.com/lists/oss-security/2025/07/10/11
https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.