The refactoring present in Apache Tomcat versions 9.0.28 to 9.0.30, 8.5.48 to 8.5.50 and 7.0.98 to 7.0.99 introduced a regression. The result of the regression was that invalid Transfer-Encoding headers were incorrectly processed leading 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.
{
"severity": "MODERATE",
"github_reviewed": true,
"cwe_ids": [
"CWE-444"
],
"nvd_published_at": "2020-02-24T22:15:00Z",
"github_reviewed_at": "2020-02-25T16:19:11Z"
}