Intrusion Prevention

Apache.Tomcat.HTTP2.DoS

Description

This indicates an attack attempt to exploit a Denial of Service Vulnerability in Apache Software Foundation Tomcat.
A remote, unauthenticated attacker can exploit this vulnerability by sending a large number of requests on several separate HTTP/2 connections with an initial window size of 0. Successful exploitation results in denial of service conditions on the target server.

Affected Products

Apache Software Foundation Tomcat 8.5.0 to 8.5.37
Apache Software Foundation Tomcat 9.0.0.M1 to 9.0.14

Impact

Denial of Service: Remote attackers can crash vulnerable systems.

Recommended Actions

Apply the most recent upgrade or patch from the vendor.
https://tomcat.apache.org/security-8.html#Fixed_in_Apache_Tomcat_8.5.38

CVE References

CVE-2019-0199