Denial of Service Vulnerability in UltraVNC Launcher by UltraVNC
CVE-2020-37132

6.7MEDIUM

Key Information:

Vendor

Ultravnc Team

Status
Ultravnc Launcher
Vendor
CVE Published:
5 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2020-37132?

UltraVNC Launcher version 1.2.4.0 is vulnerable to a denial of service attack due to improper handling of password configuration properties. An attacker with local access can input an excessively long 300-character string into the password field, leading to an application crash. This exploit disrupts the normal functioning of the launcher, hindering user access and operation. Proper input validation and length restrictions are critical for mitigating this issue.

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Deploy the Patch

Affected Version(s)

UltraVNC Launcher 1.2.4.0

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-2020-37132 - Proof of Concept

References

https://www.exploit-db.com/exploits/48290
exploit
https://www.uvnc.com/
product
https://www.vulncheck.com/advisories/ultravnc-launcher-pa...
third-party-advisory

CVSS V4

Score:
6.7
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

chuyreds
JSON
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