CVE-2020-13998

Citrix XenApp 6.5, when 2FA is enabled, allows a remote unauthenticated attacker to ascertain whether a user exists on the server, because the 2FA error page only occurs after a valid username is entered. NOTE: This vulnerability only affects products that are no longer supported by the maintainer

CVE-2012-5161

The XML Service interface in Citrix XenApp 6.5 and 6.5 Feature Pack 1 allows remote attackers to execute arbitrary code via unspecified vectors.

CVE-2016-6493

Citrix XenApp 6.x before 6.5 HRP07 and 7.x before 7.9 and Citrix XenDesktop before 7.9 might allow attackers to weaken an unspecified security mitigation via vectors related to memory permission.