CVE-2020-11996

NameCVE-2020-11996
DescriptionA specially crafted sequence of HTTP/2 requests sent to Apache Tomcat 10.0.0-M1 to 10.0.0-M5, 9.0.0.M1 to 9.0.35 and 8.5.0 to 8.5.55 could trigger high CPU usage for several seconds. If a sufficient number of such requests were made on concurrent HTTP/2 connections, the server could become unresponsive.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-2279-1, DSA-4727-1
NVD severitymedium

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
tomcat8 (PTS)stretch8.5.54-0+deb9u1vulnerable
stretch (security)8.5.54-0+deb9u4fixed
tomcat9 (PTS)buster, buster (security)9.0.31-1~deb10u2fixed
bullseye, sid9.0.39-1fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
tomcat8sourcestretch8.5.54-0+deb9u2DLA-2279-1
tomcat8source(unstable)(unfixed)
tomcat9sourcebuster9.0.31-1~deb10u2DSA-4727-1
tomcat9source(unstable)9.0.36-1

Notes

https://www.openwall.com/lists/oss-security/2020/06/25/6
https://github.com/apache/tomcat/commit/9a0231683a77e2957cea0fdee88b193b30b0c976 (9.0.36)
https://github.com/apache/tomcat/commit/c8acd2ab7371e39aeca7c306f3b5380f00afe552 (8.5.56)

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