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tomcat8

tomcat9

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tomcat11

Apache Tomcat contains an Uncontrolled Resource Consumption vulnerability affecting HTTP/2 clients that do not acknowledge the initial settings frame reducing the maximum concurrent streams. This can lead to a denial of service (DoS) condition. The issue impacts multiple versions across the 8.5.x, 9.0.x, 10.1.x, and 11.0.x branches. Fixed versions are 11.0.9, 10.1.43, and 9.0.107. Users are advised to upgrade to these versions to mitigate the risk.

CVE-2025-53506 is an Uncontrolled Resource Consumption vulnerability in Apache Tomcat where an HTTP/2 client that fails to acknowledge the initial settings frame, which reduces the maximum permitted concurrent streams, can cause excessive resource usage leading to denial of service. Affected versions include 8.5.0 through 8.5.100, 9.0.0 through 9.0.106, 10.1.0 through 10.1.42, and 11.0.0 through 11.0.8. The vulnerability is addressed in Apache Tomcat versions 11.0.9, 10.1.43, and 9.0.107.

Detailed information about UBUNTU-CVE-2025-53506 affecting null tomcat8. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2025-53506 - Live Threat Intelligence - Threat Radar | OffSeq.com

Apache Tomcat: DoS via excessive h2 streams at connection start (CVE-2025-53506)

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