High severity · published Jul 10, 2025
CVE-2025-52434
Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') vulnerability in Apache Tomcat when using the APR/Native connector
7.5
CVSS
2.1%
EPSS
No
On KEV
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 vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.1% · higher than 81% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
TO
Tomcat · Apache
9.0.0 before 9.0.107 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-52434
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-52434
Issue Tracking
https://lists.apache.org/thread/gxgh65004f25y8519coth6w7vchww030
www.openwall.com
http://www.openwall.com/lists/oss-security/2025/07/10/11
lists.debian.org
https://lists.debian.org/debian-lts-announce/2025/07/msg00009.html
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