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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.

PUBLISHED Reserved 2026-03-08 | Published 2026-03-08 | Updated 2026-03-10 | Assigner VulDB




HIGH: 7.3CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
HIGH: 7.0CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
HIGH: 7.0CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
6.0AV:L/AC:H/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR

Problem types

Uncontrolled Search Path

Untrusted Search Path

Timeline

2026-03-08:Advisory disclosed
2026-03-08:VulDB entry created
2026-03-08:VulDB entry last update

Credits

haehanse (VulDB User) reporter

VulDB coordinator

References

vuldb.com/?id.349754 (VDB-349754 | UltraVNC Windows Service cryptbase.dll uncontrolled search path) vdb-entry

vuldb.com/?ctiid.349754 (VDB-349754 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/?submit.767257 (Submit #767257 | UltraVNC 1.6.4.0 Uncontrolled Search Path) third-party-advisory

drive.google.com/...d/14ixv_1i4D2VrZWyl4RKsvFcN1AMF_qNx/view related

cve.org (CVE-2026-3787)

nvd.nist.gov (CVE-2026-3787)

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