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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Uvnc | Ultravnc | 1.6.4.0 |
| Microsoft | Windows | - |
Related Weaknesses (CWE)
References
- https://drive.google.com/file/d/14ixv_1i4D2VrZWyl4RKsvFcN1AMF_qNx/viewPermissions Required
- https://vuldb.com/?ctiid.349754Permissions RequiredVDB Entry
- https://vuldb.com/?id.349754Third Party AdvisoryVDB Entry
- https://vuldb.com/?submit.767257Third Party AdvisoryVDB Entry
FAQ
What is CVE-2026-3787?
CVE-2026-3787 is a vulnerability with a CVSS score of 7.0 (HIGH). 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 sea...
How severe is CVE-2026-3787?
CVE-2026-3787 has been rated HIGH with a CVSS base score of 7.0/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-3787?
Check the references section above for vendor advisories and patch information. Affected products include: Uvnc Ultravnc, Microsoft Windows.