| Package | Affected versions | Patched versions |
|---|---|---|
| org.apache.tomcat.embed:tomcat-embed-core | ≥ 8.5.0, < 8.5.41≥ 9.0.0.M1, < 9.0.20 | 8.5.419.0.20 |
| tomcat | = 9.0.0≥ 8.5.0, ≤ 8.5.40≥ 9.0.1, ≤ 9.0.19 |
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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