CVE-2025-52434

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.

We have discovered 8,549 live websites that are affected by CVE-2025-52434.

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Affected Software

Product  Apache Tomcat
Category Web Servers
Vulnerable Domains8,549 live websites (92% of Apache Tomcat install base)
Vulnerable Versions
  • from 5 through 8.5
  • from 8.5 through 8.5.100
  • from 9 through 9.0.106
  • from 10 through 10.0.27
Vulnerable Versions Count325 versions ( 87% of all versions)


Common Weakness Enumeration

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')



Details

  • Published - Jul 10, 2025
  • Updated - Nov 4, 2025

Credits

  • Nacl (finder)
  • 12SqweR (finder)
  • WHOAMI (finder)
  • yyzmoon (finder)

Website Distribution by Country

Number of websites using CVE-2025-52434
United States2,641 websites


China1,936 websites
Germany440 websites
Hong Kong277 websites
Italy229 websites
France221 websites
Brazil191 websites
Korea, South180 websites
Spain169 websites

Website Distribution by TLD

Number of websites using CVE-2025-52434
.com3,689 websites
.net446 websites
.cn422 websites
.de330 websites
.org277 websites
.edu213 websites
.it194 websites
.com.br192 websites
.com.cn154 websites
.fr108 websites

Vulnerable Versions

Vulnerable versions are highlighted in red

Websites affected by CVE-2025-52434

Top websites that are affected by CVE-2025-52434. Please click on the "Contact us" link to get more information.
DomainCountryRankContacts
***.***.edu United States***
**************.com Canada**,***
**.***.*****.*****.***.com United States**,***
*****.********.com United States**,***
**.******.com United States**,***
****.***.uz Uzbekistan**,***
****.******.com United States**,***
****.******.com United States**,***
****.******.com United States**,***
****.***.hk Hong Kong**,***
See full domain list

FAQ

CVE-2025-52434 is Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') in Apache Tomcat
A total of 8,549 websites have been identified as vulnerable to CVE-2025-52434, based on global website indexing conducted by WebTechSurvey.
The Apache Tomcat is affected by the CVE-2025-52434 vulnerability.
Apache Tomcat versions up to and including 10.0.27 are vulnerable to CVE-2025-52434.