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.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 9.0.0.M1 | 9.0.20 | N/A |
| org.apache.tomcat.embed:tomcat-embed-core(Maven) | 8.5.0 | 8.5.41 | N/A |
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