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

Quick assessment

Affected
n/a UltraVNC
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 7.0 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1574.002
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对搜索路径元素未加控制
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
- 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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Vendor Advisories for CVE-2026-3787 (2)

Other References for CVE-2026-3787 (1)

Same Patch Batch · n/a · 2026-03-08 · 10 CVEs total

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CVE-2026-3786 6.3 MEDIUM EasyCMS Request Parameter RbacuserAction.class.php sql injection
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CVE-2026-3749 6.3 MEDIUM Bytedesk SVG File UploadRestService.java handleFileUpload unrestricted upload
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CVE-2026-3731 5.3 MEDIUM libssh SFTP Extension Name sftp.c sftp_extensions_get_data out-of-bounds
CVE-2026-3750 4.7 MEDIUM ContiNew Admin Storage Management S3ClientFactory.java URI.create server-side request forg
CVE-2026-3714 4.7 MEDIUM OpenCart Incomplete Fix CVE-2024-36694 template.php save special elements used in a templa

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-3787

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