When running Apache Tomcat versions 9.0.0.M1 to 9.0.0, 8.5.0 to 8.5.22, 8.0.0.RC1 to 8.0.46 and 7.0.0 to 7.0.81 with HTTP PUTs enabled (e.g. via setting the readonly initialisation parameter of the Default servlet to false) it was possible to upload a JSP file to the server via a specially crafted request. This JSP could then be requested and any code it contained would be executed by the server.
www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
www.securityfocus.com/bid/100954
www.securitytracker.com/id/1039552
access.redhat.com/errata/RHSA-2017:3080
access.redhat.com/errata/RHSA-2017:3081
access.redhat.com/errata/RHSA-2017:3113
access.redhat.com/errata/RHSA-2017:3114
access.redhat.com/errata/RHSA-2018:0268
access.redhat.com/errata/RHSA-2018:0269
access.redhat.com/errata/RHSA-2018:0270
access.redhat.com/errata/RHSA-2018:0271
access.redhat.com/errata/RHSA-2018:0275
access.redhat.com/errata/RHSA-2018:0465
access.redhat.com/errata/RHSA-2018:0466
access.redhat.com/errata/RHSA-2018:2939
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lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
lists.debian.org/debian-lts-announce/2017/11/msg00009.html
security.netapp.com/advisory/ntap-20171018-0002/
security.netapp.com/advisory/ntap-20180117-0002/
support.f5.com/csp/article/K53173544
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03812en_us
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03828en_us
usn.ubuntu.com/3665-1/
www.exploit-db.com/exploits/42966/
www.exploit-db.com/exploits/43008/
www.oracle.com/technetwork/security-advisory/cpuapr2019-5072813.html