CVE-2026-4962 Details
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.
A vulnerability exists in UltraVNC versions prior to 1.6.4.0, specifically within the Service component's library version.dll. This flaw allows for an uncontrolled search path, leading to a DLL search order hijacking vulnerability. The application improperly loads the system library VERSION.DLL during the startup of the winvnc.exe service, relying on the default Windows DLL search order. An attacker with local access can place a malicious version.dll in the same directory as winvnc.exe. When the UltraVNC service starts, the malicious DLL is loaded and executed within the context of the UltraVNC process. This vulnerability could also be exploited through social engineering techniques, such as tricking a user into placing a crafted version.dll file into the UltraVNC installation directory.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 27, 2026References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://drive.google.com/file/d/1QC-MrqGsfjr4phEN77krLFZHQN8S48U_/view | [email protected] | Permissions Required |
| https://vuldb.com/?ctiid.353839 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.353839 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.777619 | [email protected] | ExploitThird Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-426 | Untrusted Search Path | [email protected] |
| CWE-427 | Uncontrolled Search Path Element | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| uvnc ultravnc | >= 1.6.0.0, <= 1.6.4.0 |
CPE
Remediation
| |
Change History
6 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Initial Analysis | [email protected] |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 27, 2026 | CVE Modified | [email protected] |
| Mar 27, 2026 | New CVE Received | [email protected] |