The CORS Filter in Apache Tomcat 9.0.0.M1 to 9.0.0.M21, 8.5.0 to 8.5.15, 8.0.0.RC1 to 8.0.44 and 7.0.41 to 7.0.78 did not add an HTTP Vary header indicating that the response varies depending on Origin. This permitted client and server side cache poisoning in some circumstances.
www.debian.org/security/2017/dsa-3974
www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
www.securityfocus.com/bid/100280
access.redhat.com/errata/RHSA-2017:1801
access.redhat.com/errata/RHSA-2017:1802
access.redhat.com/errata/RHSA-2017:3081
lists.apache.org/thread.html/1dd0a59c1295cc08ce4c9e7edae5ad2268acc9ba55adcefa0532e5ba%40%3Cdev.tomcat.apache.org%3E
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lists.apache.org/thread.html/r15695e6203b026c9e9070ca9fa95fb17dd4cd88e5342a7dc5e1e7b85%40%3Cusers.tomcat.apache.org%3E
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lists.apache.org/thread.html/r9136ff5b13e4f1941360b5a309efee2c114a14855578c3a2cbe5d19c%40%3Cdev.tomcat.apache.org%3E
lists.apache.org/thread.html/raba0fabaf4d56d4325ab2aca8814f0b30a237ab83d8106b115ee279a%40%3Cdev.tomcat.apache.org%3E
lists.debian.org/debian-lts-announce/2018/06/msg00008.html
security.netapp.com/advisory/ntap-20180614-0003/
support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03828en_us