Buffer Overflow Vulnerability in UltraVNC Launcher from UltraVNC
CVE-2019-25601

6.9MEDIUM

Key Information:

Vendor

Uvnc

Status
Ultravnc Launcher
Vendor
CVE Published:
22 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2019-25601?

UltraVNC Launcher version 1.2.2.4 has a buffer overflow vulnerability in the Path vncviewer.exe property field. This flaw can be exploited by local attackers who provide an excessively long string, leading to a denial of service condition. Specifically, a 300-byte payload of repeated characters can be input through the Properties dialog, resulting in the application crashing. Users should ensure they are using an updated version to mitigate risk.

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Deploy the Patch

Affected Version(s)

UltraVNC Launcher 1.2.2.4

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2019-25601 - Proof of Concept

References

https://www.exploit-db.com/exploits/46703
exploit
https://www.uvnc.com/
product
https://www.uvnc.com/downloads/ultravnc/126-download-ultr...
product

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Victor Mondragón
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