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CVE-2018-10381

• Severity: critical (CVSS 9.8 v3.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 3.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2018-04-26 · updated 2026-06-17
• Weakness: CWE-732

Description

TunnelBear 3.2.0.6 for Windows suffers from a SYSTEM privilege escalation vulnerability through the "TunnelBearMaintenance" service. This service establishes a NetNamedPipe endpoint that allows arbitrary installed applications to connect and call publicly exposed methods. The "OpenVPNConnect" method accepts a server list argument that provides attacker control of the OpenVPN command line. An attacker can specify a dynamic library plugin that should run for every new VPN connection attempt. This plugin will execute code in the context of the SYSTEM user.

Affected products

• McAfee Tunnelbear: 3.2.0.6

References

• https://github.com/VerSprite/research/blob/master/advisories/VS-2018-022.md
• https://github.com/VerSprite/research/blob/master/advisories/VS-2018-022.md

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