Description

UltraVNC Viewer 1.2.2.4 contains a denial of service vulnerability that allows attackers to crash the application by supplying an oversized string to the VNC Server input field. Attackers can paste a malicious string containing 256 repeated characters into the VNC Server field and click Connect to trigger a buffer overflow that crashes the viewer.

INFO

Published Date :

2026-03-22T13:38:36.517Z

Last Modified :

2026-03-24T15:14:43.698Z

Source :

VulnCheck
AFFECTED PRODUCTS

The following products are affected by CVE-2019-25600 vulnerability.

Vendors Products
Uvnc
  • Ultravnc Viewer
REFERENCES

Here, you will find a curated list of external links that provide in-depth information to CVE-2019-25600.

URL Resource
https://www.exploit-db.com/exploits/46702 cve-icon cve-icon
https://www.uvnc.com/ cve-icon cve-icon
https://www.uvnc.com/downloads/ultravnc/126-download-ultravnc-1224.html cve-icon cve-icon
https://www.vulncheck.com/advisories/ultravnc-viewer-denial-of-service-via-buffer-overflow cve-icon cve-icon
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CVSS Vulnerability Scoring System

Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Attack Requirements
Privileges Required
User Interaction
VS Confidentiality
VS Integrity
VS Availability
SS Confidentiality
SS Integrity
SS Availability
Detailed values of each vector for above chart.
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact