title: Apache Tomcat: HTTP request smuggling via malformed trailer headers
description: Improper Input Validation vulnerability in Apache Tomcat.Tomcat from 11.0.0-M1 through 11.0.0-M10, from 10.1.0-M1 through 10.1.15, from 9.0.0-M1 through 9.0.82 and from 8.5.0 through 8.5.95 did not correctly parse HTTP trailer headers. A trailer header that exceeded the header size limit could cause Tomcat to treat a single
request as multiple requests leading to the possibility of request
smuggling when behind a reverse proxy.
Users are recommended to upgrade to version 11.0.0-M11 onwards, 10.1.16 onwards, 9.0.83 onwards or 8.5.96 onwards, which fix the issue.
problem types: CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
affected:
{
defaultStatus: unaffected
product: Apache Tomcat
vendor: Apache Software Foundation
versions:
lessThanOrEqual: 11.0.0-M10, status: affected, version: 11.0.0-M1, versionType: semver
lessThanOrEqual: 10.1.15, status: affected, version: 10.1.0-M1, versionType: semver
lessThanOrEqual: 9.0.82, status: affected, version: 9.0.0-M1, versionType: semver
lessThanOrEqual: 8.5.95, status: affected, version: 8.5.0, versionType: semver
}
metrics:
other: [
content: {'text': 'important'}
type: Textual description of severity
]