---
id: CVE-2019-25601
title: UltraVNC Launcher 1.2.2.4 Denial of Service Buffer Overflow
summary: >-
  UltraVNC Launcher 1.2.2.4 contains a buffer overflow vulnerability in the Path
  vncviewer.exe property field that allows local attackers to crash the
  application by supplying an excessively long string. Attackers can input a
  300-byte payl…
severity: medium
cvss: 6.2
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-787
vendor: Uvnc
product: UltraVNC Launcher
affected:
  - ultravnc_launcher 1.2.2.4
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-03-23T16:16:39.738568Z'
exploitAvailable: true
published: '2026-03-22'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T21:44:52.782Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2019-25601'
references:
  - url: 'https://www.exploit-db.com/exploits/46703'
    label: ExploitDB-46703
  - url: 'https://www.uvnc.com/'
    label: Official Product Homepage
  - url: 'https://www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.html'
    label: Product Reference
  - url: >-
      https://www.vulncheck.com/advisories/ultravnc-launcher-denial-of-service-buffer-overflow
    label: >-
      VulnCheck Advisory: UltraVNC Launcher 1.2.2.4 Denial of Service Buffer
      Overflow
tags:
  - cve.org
  - exploit-available
epss: 0.00263
epssPercentile: 0.16428
ingestedAt: '2026-10-01T23:03:32.845Z'
---

## Overview

UltraVNC Launcher 1.2.2.4 contains a buffer overflow vulnerability in the Path vncviewer.exe property field that allows local attackers to crash the application by supplying an excessively long string. Attackers can input a 300-byte payload of repeated characters through the Properties dialog to trigger a denial of service condition.

## Affected

- `ultravnc_launcher 1.2.2.4`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.