Incomplete Fix for CVE-2019-0199: HTTP/2 Connection Window Exhaustion Vulnerability in Apache Tomcat

CVE-2019-10072 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:N/A:P

The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write in Apache Tomcat versions 9.0.0.M1 to 9.0.19 and 8.5.0 to 8.5.40 . By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

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