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    CVE-2026-3787

    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.

    Published:Mar 8, 2026
    Last Modified:Apr 16, 2026
    EPS:Mar 8, 2026
    EPSS Score:0.00007
    CVSS Score:7

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Ultravnc
    Product
    Ultravnc
    Vendor
    Uvnc
    Product
    Ultravnc

    Exploits

    No exploit reference

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High