CVE-2026-3787

Description

A weakness has been identified in UltraVNC 1.6.4.0 on Windows. This affects an unknown function in the library cryptbase.dll of the component Windows Service. This manipulation causes uncontrolled search path. The attack requires local access. A high degree of complexity is needed for the attack. The exploitability is reported as difficult. The vendor was contacted early about this disclosure but did not respond in any way.

Risk Information

Base Score

7.0

MODERATE

Vector

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

EPSS Score

Exploitation Probability

0.005

Associated Vulnerability

Vulnerability	OS Platform
Vulnerabilities CVE-2026-3787 are affected in UltraVNC (MSI) (x64) 1.6.4.0	Windows
Vulnerabilities CVE-2026-3787 are affected in UltraVNC (MSI) 1.6.4.0	Windows
Vulnerabilities CVE-2026-3787 are affected in UltraVNC (x64) 1.6.4.0	Windows
Vulnerabilities CVE-2026-3787 are affected in UltraVNC (x86) 1.6.4.0	Windows

Patch Details

No records found

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234