HTTP Request Smuggling Affecting org.apache.tomcat:tomcat-coyote 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-coyote to version 10.0.7, 9.0.48, 8.5.68 or higher.


org.apache.tomcat:tomcat-coyote is a Tomcat Connectors and HTTP parser.

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.