CVE-2020-37134

HIGH

UltraVNC Viewer 1.2.4.0 - DoS

Title source: llm

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.

Exploits (1)

exploitdb WORKING POC
by chuyreds · pythondoswindows
https://www.exploit-db.com/exploits/48291

References (3)

Scores

CVSS v3 7.5
EPSS 0.0001
EPSS Percentile 2.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-770
Status published
Products (1)
UltraVNC Team/UltraVNC Viewer 1.2.4.0
Published Feb 05, 2026
Tracked Since Feb 18, 2026