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CVE-2020-11996

Quick assessment

Affected
Apache Apache Tomcat
Exploitation
Public or AI PoC available; prioritize validation
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。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 10.0.0-M1版本至10.0.0-M5版本、9.0.0.M1版本至9.0.35版本和8.5.0版本至8.5.55版本中存在安全漏洞。攻击者可通过发出大量请求利用该漏洞导致服务器无法响应。

AI Predicted 7.5 Difficulty: Easy EPSS 26.70% · P98

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2020-11996

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
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。该程序实现了对Servlet和JavaServer Page（JSP）的支持。 Apache Tomcat 10.0.0-M1版本至10.0.0-M5版本、9.0.0.M1版本至9.0.35版本和8.5.0版本至8.5.55版本中存在安全漏洞。攻击者可通过发出大量请求利用该漏洞导致服务器无法响应。
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 Apache Tomcat 10.0.0-M1 to 10.0.0-M5 -

II. Public POCs for CVE-2020-11996

# POC Description Source Link Shenlong Link
1 tomcat-embed-core-9.0.31 CVE-2020-11996 Test PoC https://github.com/rusakovichma/tomcat-embed-core-9.0.31-CVE-2020-11996 POC Details
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III. Intelligence Information for CVE-2020-11996

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Vendor Advisories for CVE-2020-11996 (5)

Mailing List Discussions for CVE-2020-11996 (19)

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache

V. Comments for CVE-2020-11996

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