In Apache Tomcat 9.0.0.M1 to 9.0.0.M18 and 8.5.0 to 8.5.12, the handling of an HTTP/2 GOAWAY frame for a connection did not close streams associated with that connection that were currently waiting for a WINDOW_UPDATE before allowing the application to write more data. These waiting streams each consumed a thread. A malicious client could therefore construct a series of HTTP/2 requests that would consume all available processing threads.
www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html
github.com/apache/tomcat
github.com/apache/tomcat/commit/2cb9c724e6a2d15a5bc909c4bf1ab9dfc26fa362
github.com/apache/tomcat/commit/5496e193a89b8b8b3177e516358df2f07ab852b3
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nvd.nist.gov/vuln/detail/CVE-2017-5650
security.gentoo.org/glsa/201705-09
security.netapp.com/advisory/ntap-20180614-0001
web.archive.org/web/20170417124144/www.securityfocus.com/bid/97531
web.archive.org/web/20170906032952/www.securitytracker.com/id/1038217