HTTP Request Smuggling Affecting org.apache.tomcat:tomcat package, versions [10.0.0-M1,10.0.7) [9.0.0.M1,9.0.48) [8.5.0,8.5.68)

  • Attack Complexity


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  • snyk-id


  • published

    13 Jul 2021

  • disclosed

    13 Jul 2021

  • credit

    Bahruz Jabiyev of NEU SecLab, Steven Sprecher of NEU SecLab, Kaan Onarlioglu of NEU SecLab

How to fix?

Upgrade org.apache.tomcat:tomcat to version 10.0.7, 9.0.48, 8.5.68 or higher.


org.apache.tomcat:tomcat is an implementation of the Java Servlet, JavaServer Pages, Java Expression Language and Java WebSocket technologies.

Affected versions of this package are vulnerable to HTTP Request Smuggling. Tomcat does not correctly parse the HTTP transfer-encoding request header in some circumstances, leading to the possibility of request smuggling when used with a reverse proxy.

Specifically, Tomcat incorrectly ignores the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; it honours the identify encoding; and it does not ensure that, if present, the chunked encoding was the final encoding.