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CVE

CVE-2026-4962

A security flaw has been discovered in UltraVNC up to 1.6.4.0. Affected by this issue is some unknown functionality in t

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.

HIGH · CVSS 7 EPSS 8e-05
Act now
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules2 YARA rules0
⬡

Weakness Classification

CWE-426Untrusted Search Path
CWE-427Uncontrolled Search Path Element
▤

Affected Products & Versions

1
uvnc ultravnc>= 1.6.0.0 and <= 1.6.4.0
⚠

Public Exploits & PoCs

1
pocvuldb.com · ?submit.777619vuldb.com
◈

Sigma Hunt Rules

2
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
producthighSuspicious UltraVNC Execution
productmediumUse of UltraVNC Remote Access Software
▣

Scoring & Timeline

7
HIGH · CVSS v3.1 · cna@vuldb.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD27 Mar 2026 · 05:16 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
poc
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://drive.google.com/file/d/1QC-MrqGsfjr4phEN77krLFZHQN8S48U_/viewPermissions Required
https://vuldb.com/?ctiid.353839Permissions RequiredVDB Entry
https://vuldb.com/?id.353839Third Party AdvisoryVDB Entry
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