CVE-2020-37134 - CVE House
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Status published Medium CVE-2020-37134

UltraVNC Viewer 1.2.4.0 - 'VNCServer' Denial of Service

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • chuyreds

Affected Vendor

UltraVNC Team

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Affected Software

UltraVNC Viewer
Vulnerable Versions:
1.2.4.0

Timeline

Official Publish: February 5th, 2026
Last Modified: March 5th, 2026
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)