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CVE-2021-41079— Apache Tomcat DoS with unexpected TLS packet

Quick assessment

Affected
Apache Software Foundation Apache Tomcat
Exploitation
High exploitation probability; assess promptly
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 存在输入验证错误漏洞，该漏洞源于程序处理某些 TLS 数据包时存在无限循环，远程攻击者可以向应用程序发送特制的数据包，消耗所有可用的系统资源并导致拒绝服务条件。

AI Predicted 7.5 Difficulty: Easy EPSS 7.18% · P94

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-41079

Vulnerability Information
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Vulnerability Title
Apache Tomcat DoS with unexpected TLS packet
Source: CVE Program / CVE List V5
Vulnerability Description
Apache Tomcat 8.5.0 to 8.5.63, 9.0.0-M1 to 9.0.43 and 10.0.0-M1 to 10.0.2 did not properly validate incoming TLS packets. When Tomcat was configured to use NIO+OpenSSL or NIO2+OpenSSL for TLS, a specially crafted packet could be used to trigger an infinite loop resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
输入验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Apache Tomcat 输入验证错误漏洞
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 存在输入验证错误漏洞，该漏洞源于程序处理某些 TLS 数据包时存在无限循环，远程攻击者可以向应用程序发送特制的数据包，消耗所有可用的系统资源并导致拒绝服务条件。
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 Apache Tomcat 8.5 8.5.0 to 8.5.63 -

II. Public POCs for CVE-2021-41079

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III. Intelligence Information for CVE-2021-41079

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Vendor Advisories for CVE-2021-41079 (1)

Mailing List Discussions for CVE-2021-41079 (4)

Same Patch Batch · Apache Software Foundation · 2021-09-16 · 6 CVEs total

CVE-2021-40438 mod_proxy SSRF
CVE-2021-39275 ap_escape_quotes buffer overflow
CVE-2021-39239 XML External Entity (XXE) vulnerability
CVE-2021-36160 mod_proxy_uwsgi out of bound read
CVE-2021-34798 NULL pointer dereference in httpd core

IV. Related Vulnerabilities

Same product: Apache Tomcat
Same vendor: Apache Software Foundation
Same weakness: CWE-20

V. Comments for CVE-2021-41079

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