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CVE-2020-13998

MEDIUMCVSS 5.3/10EPSS 1.39%

Last modified

CVE-2020-13998 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. 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. EPSS estimates a 1.39% chance of exploitation in the next 30 days.

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

Metrics

CVSS 3.1
5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS Probability
1.39%

68.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CitrixXenapp6.5.0.0

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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
How severe is CVE-2020-13998?
CVE-2020-13998 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.39% probability of exploitation in the next 30 days.
How do I fix CVE-2020-13998?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-13998?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST