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Description

A security flaw has been discovered in UltraVNC up to 1.6.4.0. Affected by this issue is some unknown functionality in the library version.dll of the component Service. The manipulation results in uncontrolled search path. The attack needs to be approached locally. This attack is characterized by high complexity. The exploitation is known to be difficult. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

PUBLISHED Reserved 2026-03-27 | Published 2026-03-27 | Updated 2026-03-27 | 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

2026-03-27:Advisory disclosed
2026-03-27:VulDB entry created
2026-03-27:VulDB entry last update

Credits

haehanse (VulDB User) reporter

VulDB coordinator

References

vuldb.com/?id.353839 (VDB-353839 | UltraVNC Service version.dll uncontrolled search path) vdb-entry

vuldb.com/?ctiid.353839 (VDB-353839 | CTI Indicators (IOB, IOC, TTP, IOA)) signature permissions-required

vuldb.com/?submit.777619 (Submit #777619 | UltraVNC 1.6.4.0 Uncontrolled Search Path-Privilege escalation with version.dll) third-party-advisory

drive.google.com/...d/1QC-MrqGsfjr4phEN77krLFZHQN8S48U_/view exploit

cve.org (CVE-2026-4962)

nvd.nist.gov (CVE-2026-4962)

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