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

CVSS 7.0 · High EPSS 0.01% · P1
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I. Basic Information for CVE-2026-3787

Vulnerability Information
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Vulnerability Title
UltraVNC Windows Service cryptbase.dll uncontrolled search path
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对搜索路径元素未加控制
Source: NVD (National Vulnerability Database)
Vulnerability Title
UltraVNC 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
UltraVNC是UltraVNC公司的一款用于Windows平台的开源远程终端控制软件。 UltraVNC 1.6.4.0版本存在代码问题漏洞，该漏洞源于库cryptbase.dll存在不受控制的搜索路径问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
-UltraVNC 1.6.4.0 cpe:2.3:a:ultravnc:ultravnc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-3787

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III. Intelligence Information for CVE-2026-3787

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IV. Related Vulnerabilities

Same product: UltraVNC
Same vendor: n/a
Same weakness: CWE-427

V. Comments for CVE-2026-3787

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