CVE-2020-37133

HIGH 7.5CVE-2020-37133 · Published 05/02/2026 · updated 17/06/2026

In short

CVE-2020-37133 is a HIGH (CVSS 7.5) vulnerability affecting ultravnc (uvnc).
Chance of exploitation in the next 30 days (EPSS): 0.54%, higher than 45.3% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
ultravnc uvnc	`≤ 1.2.4.0`	No fix yet

Description

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.

References

exploit-db.com/exploits/48288 · Exploit
uvnc.com · Product
vulncheck.com/advisories/ultravnc-launcher-repeaterhost-denial-of-service · Third Party Advisory

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Package

Affected versions

Patched versions

ultravnc

uvnc

≤ 1.2.4.0

No fix yet

More vulnerabilities in ultravnc

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