CVE-2020-37133: UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service

Published Feb 5, 2026
·
Updated

UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in the Repeater Host configuration field that allows attackers to crash the application. Attackers can paste an overly long string of 300 characters into the Repeater Host property to trigger an application crash.

Affected Software

2 affected components
UltraVNC UltraVNC Launcher
Uvnc Ultravnc<=1.2.4.0

Event History

Feb 5, 2026
CVE Published
via MITRE·04:13 PM
Data Sourced
via MITRE·04:13 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·05:16 PM
DescriptionSeverityWeaknessAffected Software
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of CVE-2020-37133?

CVE-2020-37133 is classified as a denial of service vulnerability.

2

How do I fix CVE-2020-37133?

To mitigate CVE-2020-37133, ensure that input validation is implemented to limit the length of strings entered in the Repeater Host configuration field.

3

What software is affected by CVE-2020-37133?

CVE-2020-37133 affects UltraVNC Launcher version 1.2.4.0.

4

What type of attack does CVE-2020-37133 enable?

CVE-2020-37133 enables attackers to conduct a denial of service attack by crashing the application.

5

Is CVE-2020-37133 exploitable remotely?

Yes, CVE-2020-37133 can be exploited remotely by an attacker who inputs an excessively long string into the Repeater Host configuration.

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203