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CVE-2026-19586 is a critical OS command injection vulnerability in TP-Link ER7212PC v2 devices configured as OpenVPN servers. It allows unauthenticated remote attackers to execute arbitrary commands by sending crafted input during OpenVPN connection establishment before authentication. Exploitation requires the OpenVPN Server feature to be enabled and reachable by the attacker. Successful exploitation could lead to full device compromise.

This vulnerability arises from improper neutralization of special elements in client-supplied data during OpenVPN connection setup on TP-Link ER7212PC v2 devices. An unauthenticated attacker can inject OS commands by manipulating input before authentication completes, potentially executing arbitrary commands on the device. The attack surface is limited to devices with OpenVPN Server enabled and accessible to the attacker. The CVSS 4.0 score is 9.3, indicating critical severity with network attack vector, no privileges or user interaction required, and high impact on confidentiality, integrity, and availability.

Detailed information about CVE-2026-19586: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in TP-Link Systems 

CVE-2026-19586: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in TP-Link Systems Inc. ER7212PC v2 - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-19586: CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in TP-Link Systems Inc. ER7212PC v2

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