CVE-2021-33037 HTTP request smuggling

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 10.0.0-M1 to 10.0.6
Apache Tomcat 9.0.0.M1 to 9.0.46
Apache Tomcat 8.5.0 to 8.5.66

Apache Tomcat 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.</p>

Users of the affected versions should apply one of the following
- Upgrade to Apache Tomcat 10.0.7 or later
- Upgrade to Apache Tomcat 9.0.48 or later
- Upgrade to Apache Tomcat 8.5.68 or later
Note that issue was fixed in 9.0.47 and 8.5.67 but the release votes for those versions did not pass.

2021-07-12 Original advisory


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