CVE-2020-37133

UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service

UltraVNC Launcher 1.2.4.0 contains a denial of service vulnerability in the Repeater Host configuration field that allows attackers to crash the application. Attackers can paste an overly long string of 300 characters into the Repeater Host property to trigger an application crash.

Affected

UltraVNC Team · UltraVNC Launcher

CVSS v4.0 VULNCHECK

6.7 MEDIUMCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 VULNCHECK

7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

0.55% chance of exploitation in the next 30 days, 45th percentile

Published

2026-02-05

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/48288

Security advisories

• https://www.vulncheck.com/advisories/ultravnc-launcher-repeaterhost-denial-of-service
• https://www.uvnc.com

References

• CVE Record
• NVD entry