In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 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.
{
"nvd_published_at": "2020-02-24T22:15:00Z",
"severity": "MODERATE",
"github_reviewed": true,
"cwe_ids": [
"CWE-444"
],
"github_reviewed_at": "2020-02-25T16:18:59Z"
}