CVE-2009-4118: Cisco VPN Client

Low severity, CVSS 2.1. EPSS: 2.5% chance of exploitation in the next 30 days.

The StartServiceCtrlDispatcher function in the cvpnd service (cvpnd.exe) in Cisco VPN client for Windows before 5.0.06.0100 does not properly handle an ERROR_FAILED_SERVICE_CONTROLLER_CONNECT error, which allows local users to cause a denial of service (service crash and VPN connection loss) via a manual start of cvpnd.exe while the cvpnd service is running.

Affected products

• Cisco VPN Client: version 2.0 only; version 3.0 only; version 3.0.5 only; version 3.1 only; version 3.5.1 only; version 3.5.1c only; …

Published 2009-12-01. Last modified 2026-06-16.