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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | UltraVNC | 1.6.4.0 | — |
Advisories 1
- WID-SEC-2026-0637 UltraVNC: Schwachstelle ermöglicht Codeausführung BSI CERT-Bund (WID) · Mar 8, 2026
References
- VDB-349754 | UltraVNC Windows Service cryptbase.dll uncontrolled search path vdb-entry
- VDB-349754 | CTI Indicators (IOB, IOC, TTP, IOA) signature permissions-required
- Submit #767257 | UltraVNC 1.6.4.0 Uncontrolled Search Path third-party-advisory
- https://drive.google.com/file/d/14ixv_1i4D2VrZWyl4RKsvFcN1AMF_qNx/view related