CVE-2026-3787 Details
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.
A vulnerability exists in UltraVNC version 1.6.4.0 on Windows, specifically within the Windows Service component that utilizes the cryptbase.dll library. This vulnerability arises from an uncontrolled search path issue, allowing local attackers to manipulate the DLL loading process. The exploitation of this vulnerability could lead to arbitrary code execution, particularly if the UltraVNC service is running with elevated privileges.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 10, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://drive.google.com/file/d/14ixv_1i4D2VrZWyl4RKsvFcN1AMF_qNx/view | [email protected] | Permissions Required |
| https://vuldb.com/?ctiid.349754 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.349754 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.767257 | [email protected] | Third Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-426 | Untrusted Search Path | [email protected] |
| CWE-426 | Untrusted Search Path | [email protected] |
| CWE-427 | Uncontrolled Search Path Element | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| uvnc ultravnc | 1.6.4.0 |
CPE
Remediation
| |
| microsoft windows | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 10, 2026 | Initial Analysis | [email protected] |
| Mar 8, 2026 | New CVE Received | [email protected] |