HTTP Request Smuggling The advisory has been revoked - it doesn't affect any version of package tomcat7 (opens in a new tab)

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75.35% (100^th percentile)

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Snyk IDSNYK-UBUNTU1804-TOMCAT7-1319066
published22 Aug 2025
disclosed12 Jul 2021

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Introduced: 12 Jul 2021

CVE-2021-33037 (opens in a new tab) CWE-444 (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:18.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream tomcat7 package and not the tomcat7 package as distributed by Ubuntu.

Apache Tomcat 10.0.0-M1 to 10.0.6, 9.0.0.M1 to 9.0.46 and 8.5.0 to 8.5.66 did not correctly parse the HTTP transfer-encoding request header in some circumstances leading to the possibility to request smuggling when used with a reverse proxy. Specifically: - Tomcat incorrectly ignored the transfer encoding header if the client declared it would only accept an HTTP/1.0 response; - Tomcat honoured the identify encoding; and - Tomcat did not ensure that, if present, the chunked encoding was the final encoding.