Microsoft · Windows · CVE-2026-3787
**Name of the Vulnerable Software and Affected Versions**
UltraVNC version 1.6.4.0
**Description**
A weakness exists in UltraVNC 1.6.4.0 on Windows. The issue affects an unknown function within the `cryptbase.dll` library of the Windows Service component, leading to an uncontrolled search path. Local access is required for exploitation, and the exploitability is considered difficult due to the high complexity involved. The vendor was contacted regarding this disclosure but did not provide a response.
**Recommendations**
Update to a newer version that contains a fix for this vulnerability. As a temporary workaround, consider restricting access to the Windows Service component to minimize the risk of exploitation.