CVE-2026-3787 HIGH

CVE-2026-3787: UltraVNC Windows Service cryptbase.dll uncontrolled search path

Vendor N/A
Product UltraVNC
Weakness CWE-427
Published March 8, 2026
Last update March 10, 2026
View on NVD All CVEs

CVSS base score

7.3/10
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 8, 2026 CVE published
March 10, 2026 Record updated