CVE-2021-44554

Name: CVE-2021-44554
Creator: NVD / NIST
Published: 2021-12-20T09:15:06.727+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.3/10EPSS 1.03%

Last modified Jun 17, 2026

CVE-2021-44554 is a medium-severity vulnerability rated 5.3/10 on the CVSS scale. Thinfinity VirtualUI before 3.0 allows a malicious actor to enumerate users registered in the OS (Windows) through the /changePassword URI. By accessing the vector, an attacker can determine if a username exists thanks to the message returned; it can be presented in different languages according to the configuration of VirtualUI. EPSS estimates a 1.03% chance of exploitation in the next 30 days.

Description

Thinfinity VirtualUI before 3.0 allows a malicious actor to enumerate users registered in the OS (Windows) through the /changePassword URI. By accessing the vector, an attacker can determine if a username exists thanks to the message returned; it can be presented in different languages according to the configuration of VirtualUI. Common users are administrator, admin, guest and krgtbt.

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

1.03%

59.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-203

Affected Software

Vendor	Product	Versions
Cybelesoft	Thinfinity Virtualui	< 3.0

References

https://github.com/cybelesoft/virtualui/issues/1Exploit, Issue Tracking, Third Party Advisory
https://github.com/cybelesoft/virtualui/issues/1Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Dec 20, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-44554?

How severe is CVE-2021-44554?

CVE-2021-44554 has a CVSS score of 5.3/10 (MEDIUM severity). The EPSS model estimates a 1.03% probability of exploitation in the next 30 days.

How do I fix CVE-2021-44554?

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-2021-44554?

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

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Source: NVD / NIST