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

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat存在资源管理错误漏洞，该漏洞源于HTTP/2客户端未确认初始设置帧，可能导致资源消耗不受控制。以下版本受到影响：11.0.0-M1至11.0.8版本、10.1.0-M1至10.1.42版本和9.0.0.M1至9.0.106版本。

AI Predicted 5.3 Difficulty: Easy EPSS 1.99% · P79

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2025-53506

Vulnerability Information
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Vulnerability Title
Apache Tomcat: DoS via excessive h2 streams at connection start
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Apache Tomcat是美国阿帕奇（Apache）基金会的一款轻量级Web应用服务器。用于实现对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat存在资源管理错误漏洞，该漏洞源于HTTP/2客户端未确认初始设置帧，可能导致资源消耗不受控制。以下版本受到影响：11.0.0-M1至11.0.8版本、10.1.0-M1至10.1.42版本和9.0.0.M1至9.0.106版本。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Apache Software Foundation Apache Tomcat 11.0.0-M1 ~ 11.0.8 -

II. Public POCs for CVE-2025-53506

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III. Intelligence Information for CVE-2025-53506

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Same Patch Batch · Apache Software Foundation · 2025-07-10 · 11 CVEs total

CVE-2024-42516 Apache HTTP Server: HTTP response splitting
CVE-2024-43204 Apache HTTP Server: SSRF with mod_headers setting Content-Type header
CVE-2024-47252 Apache HTTP Server: mod_ssl error log variable escaping
CVE-2024-43394 Apache HTTP Server: SSRF on Windows due to UNC paths
CVE-2025-23048 Apache HTTP Server: mod_ssl access control bypass with session resumption
CVE-2025-49630 Apache HTTP Server: mod_proxy_http2 denial of service
CVE-2025-49812 Apache HTTP Server: mod_ssl TLS upgrade attack
CVE-2025-53020 Apache HTTP Server: HTTP/2 DoS by Memory Increase
CVE-2025-52434 Apache Tomcat: APR/Native Connector crash leading to DoS
CVE-2025-52520 Apache Tomcat: DoS via integer overflow in multipart file upload

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-400

V. Comments for CVE-2025-53506

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