CVE-2020-37134

HIGH

7.5

Description

UltraVNC Viewer 1.2.4.0 contains a denial of service vulnerability that allows attackers to crash the application by manipulating VNC Server input. Attackers can generate a malformed 256-byte payload and paste it into the VNC Server connection dialog to trigger an application crash.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/5/2026

Last Modified2/5/2026

Sourcenvd

Honeypot Sightings0

Weaknesses (CWE)

CWE-770

References

https://www.exploit-db.com/exploits/48291(disclosure@vulncheck.com)

https://www.uvnc.com/(disclosure@vulncheck.com)

https://www.vulncheck.com/advisories/ultravnc-viewer-vncserver-denial-of-service(disclosure@vulncheck.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.