What’s Vulnerable › Vulnerabilities

CVE-2020-13998

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-06-11 · updated 2026-06-17
• Weakness: CWE-203

Description

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: 6.5.0.0 (and their updates)
• Citrix Xenapp: 6.5.0.0

References

• https://gist.github.com/kampji/11e259d68ad98a6f0f898132f1961a96
• https://gist.github.com/kampji/11e259d68ad98a6f0f898132f1961a96

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