Cisco SD-WAN CVE-2026-20245 flaw lets hackers gain root via file upload

A critical security warning has been issued regarding a command injection vulnerability in Cisco SD-WAN, tracked as CVE-2026-20245. This flaw poses significant risks as it allows authenticated attackers to gain root access by uploading malicious files due to insufficient validation in the file transfer payloads. Active exploitation of this vulnerability has been confirmed, necessitating immediate protective measures from administrators.

Remediation involves thorough log auditing and custom isolation workarounds, as standard patches are not yet available. Attackers must have netadmin privileges, or can leverage prior software exploits to access the system.