CVE-2020-37133

UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service

CVSS 6.7 MEDIUMEPSS 0.5%CWE-121

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.7EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

05 Feb 2026Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

Affected products

UltraVNC Team · UltraVNC Launcher

Want to know if your infrastructure is exposed to this?

Talk to TrueHacking →

References

https://www.exploit-db.com/exploits/48288 https://www.uvnc.com/https://www.vulncheck.com/advisories/ultravnc-launcher-repeaterhost-denial-of-service