CVE-2020-37132

MEDIUM

UltraVNC < 1.2.4.0 - Denial of Service via Password Field Overflow

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2020-37132. PoCs published by chuyreds.

AI-analyzed exploit summary This exploit demonstrates a local Denial of Service (DoS) vulnerability in UltraVNC Launcher 1.2.4.0 by overflowing the 'Password' field with a buffer of 300 'A' characters, causing the application to crash when pasted into the properties dialog.

Description

UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in its password configuration properties that allows local attackers to crash the application. Attackers can paste an overly long 300-character string into the password field to trigger an application crash and prevent normal launcher functionality.

Exploits (1)

exploitdb WORKING POC
by chuyreds · pythondoswindows
https://www.exploit-db.com/exploits/48290

This exploit demonstrates a local Denial of Service (DoS) vulnerability in UltraVNC Launcher 1.2.4.0 by overflowing the 'Password' field with a buffer of 300 'A' characters, causing the application to crash when pasted into the properties dialog.

Classification
Working Poc 95%
Attack Type
Dos
Complexity
Trivial
Reliability
Reliable
Target: UltraVNC Launcher 1.2.4.0
No auth needed
Prerequisites: Local access to the system running UltraVNC Launcher · Ability to execute Python script to generate payload
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (3)

Core 3
Core References
Exploit, Third Party Advisory, VDB Entry exploit
https://www.exploit-db.com/exploits/48290
Product product
https://www.uvnc.com/

Scores

CVSS v3 6.2
EPSS 0.0023
EPSS Percentile 13.4%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation poc
Automatable no
Technical Impact partial

Details

CWE
CWE-121 CWE-787
Status published
Products (1)
uvnc/ultravnc < 1.2.4.0
Published Feb 05, 2026
Tracked Since Feb 18, 2026