CVE-2020-13998: Citrix Xenapp

Medium severity, CVSS 5.3. EPSS: 1.4% chance of exploitation in the next 30 days.

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

Affected products

• Citrix Xenapp: version 6.5.0.0 only

Published 2020-06-11. Last modified 2026-06-17.