CVE-2020-37133

UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service

Published Feb 5, 2026 CVSS 4.0 · 6.7 Medium EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Uvnc
Uvnc ultravnc
Weaknesses CWE-787
CPEs cpe:2.3:a:uvnc:ultravnc:*:*:*:*:*:*:*:*
Vendors & Products Uvnc
Uvnc ultravnc
Type Values Removed Values Added
First Time appeared Ultravnc
Ultravnc ultravnc
Vendors & Products Ultravnc
Ultravnc ultravnc
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title UltraVNC Launcher 1.2.4.0 - 'RepeaterHost' Denial of Service
Weaknesses CWE-121
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

cvssV4_0

{'score': 6.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Feb 5, 2026, 6:44 PM
Reserved
Feb 3, 2026, 4:27 PM
Status
Analyzed
Published
Feb 5, 2026, 5:16 PM
Modified
Jun 17, 2026, 3:17 AM