Cisco Warns of Actively Exploited Critical SD-WAN Vulnerability Allowing Remote Administrative Access

Cisco has issued an urgent security advisory after confirming that a critical authentication bypass vulnerability affecting its Catalyst SD-WAN infrastructure is being actively exploited in real-world attacks, prompting widespread concern across enterprise and government networks worldwide.

The flaw, tracked as CVE-2026-20182, carries the maximum possible CVSS severity score of 10.0 and impacts several core components of Cisco’s SD-WAN ecosystem. According to the company, attackers can exploit the vulnerability remotely and without authentication to gain elevated administrative access to affected systems.

Successful exploitation could allow attackers to manipulate enterprise network traffic, alter SD-WAN configurations, establish persistence inside critical infrastructure environments, and potentially disrupt…