Introduction

The discovery of a critical vulnerability in Cisco's Secure Firewall Management Center (FMC) software has raised significant concerns in the cybersecurity community. This vulnerability, identified as CVE-2025-20265, poses a severe risk with a maximum CVSS score of 10.0, allowing unauthenticated remote attackers to execute arbitrary shell commands on affected systems. This article provides a detailed analysis of this critical security flaw and its implications for organizations relying on Cisco's network security products.