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High severity7.5NVD Advisory· Published Jul 10, 2025· Updated Jun 17, 2026

CVE-2025-53506

CVE-2025-53506

Description

Uncontrolled Resource Consumption vulnerability in Apache Tomcat if an HTTP/2 client did not acknowledge the initial settings frame that reduces the maximum permitted concurrent streams.

This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.8, from 10.1.0-M1 through 10.1.42, 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 EOL versions may also be affected.

Users are recommended to upgrade to version 11.0.9, 10.1.43 or 9.0.107, which fix the issue.

AI Insight

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
org.apache.tomcat:tomcat-coyoteMaven
>= 11.0.0-M1, < 11.0.911.0.9
org.apache.tomcat:tomcat-coyoteMaven
>= 10.1.0-M1, < 10.1.4310.1.43
org.apache.tomcat:tomcat-coyoteMaven
>= 9.0.0.M1, < 9.0.1079.0.107
org.apache.tomcat:tomcat-coyoteMaven
>= 8.5.0, <= 8.5.100—
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 8.5.0, <= 8.5.100—
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 9.0.0.M1, < 9.0.1079.0.107
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 10.1.0-M1, < 10.1.4310.1.43
org.apache.tomcat.embed:tomcat-embed-coreMaven
>= 11.0.0-M1, < 11.0.911.0.9

Affected products

69

Patches

Vulnerability mechanics

References

8

News mentions

0

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