CVE-2020-13998 Information disclosure in n/a

High 7.5 Published 11 Jun 2020 Updated 4 Aug 2024

Remote attackers can enumerate valid usernames on Citrix XenApp servers when two-factor authentication is enabled, revealing user existence.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-13998?

CVE-2020-13998 is a high-severity vulnerability in n/a, published on 11 Jun 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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

Weakness: CWE-203, CWE-639

Which versions are affected by CVE-2020-13998?

It affects 1 product.

Products include Citrix Xenapp.

How do I fix CVE-2020-13998?

No fix has been published for CVE-2020-13998 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-13998 being exploited?

There is no known exploitation of CVE-2020-13998 in the wild and no public exploit code.

Sources

Also known as GHSA-5x67-frfj-mmvh.