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From Mark Thomas <>
Subject [SECURITY] CVE-2020-1935 HTTP Request Smuggling
Date Mon, 24 Feb 2020 12:47:08 GMT
CVE-2020-1935 HTTP Request Smuggling

Severity: Low

Vendor: The Apache Software Foundation

Versions Affected:
Apache Tomcat 9.0.0.M1 to 9.0.30
Apache Tomcat 8.5.0 to 8.5.50
Apache Tomcat 7.0.0 to 7.0.99

The HTTP header parsing code used an approach to end-of-line parsing
that allowed some invalid HTTP headers to be parsed as valid. This led
to a possibility of HTTP Request Smuggling if Tomcat was located behind
a reverse proxy that incorrectly handled the invalid Transfer-Encoding
header in a particular manner. Such a reverse proxy is considered unlikely.

- Upgrade to Apache Tomcat 9.0.31 or later
- Upgrade to Apache Tomcat 8.5.51 or later
- Upgrade to Apache Tomcat 7.0.100 or later

This issue was found by @ZeddYu and reported responsibly to the Apache
Tomcat Security Team.


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