Adobe Flash Player 21.0.0.197 and earlier allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via unspecified vectors, as exploited in the wild in April 2016.
https://security.gentoo.org/glsa/201606-08
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2016/ms16-050
http://rhn.redhat.com/errata/RHSA-2016-0610.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00045.html
http://lists.opensuse.org/opensuse-security-announce/2016-05/msg00044.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00055.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00010.html
http://lists.opensuse.org/opensuse-security-announce/2016-04/msg00009.html
https://www.fireeye.com/blog/threat-research/2016/04/cve-2016-1019_a_new.html
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2016-1019
https://helpx.adobe.com/security/products/flash-player/apsb16-10.html
https://helpx.adobe.com/security/products/flash-player/apsa16-01.html
https://github.com/cisagov/vulnrichment/issues/196
http://www.securitytracker.com/id/1035491