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Cisco Secure Firewall Vulnerability Exposes Networks to Authentication Bypass Attacks

Cisco has identified a critical vulnerability in its Secure Firewall Management Center (FMC) Software, which enables unauthenticated remote attackers to gain root access to affected devices. This vulnerability has been assigned a maximum severity CVSS…

NBy Nathan ColeMar 05, 20261 min read

Cisco has identified a critical vulnerability in its Secure Firewall Management Center (FMC) Software, which enables unauthenticated remote attackers to gain root access to affected devices. This vulnerability has been assigned a maximum severity CVSS score of 10.0, indicating an urgent need for attention from network administrators.

The vulnerability was discovered during internal security testing by Cisco researcher Brandon Sakai. It presents a significant risk to enterprise network infrastructure due to an improperly created system process that starts during the device's boot sequence.

Attackers can exploit this flaw by sending crafted HTTP requests to the targeted FMC web interface, bypassing authentication protocols entirely. Successful exploitation allows attackers to execute malicious scripts and gain full control over the operating system, potentially altering security policies and monitoring network traffic.

Vulnerability Detail Information

CVE ID CVE-2026-20079

Advisory ID cisco-sa-onprem-fmc-authbypass-5JPp45V2

This vulnerability has been assigned a maximum severity CVSS score of 10.0, indicating an urgent need for attention from network administrators.
Nathan Cole · Thehackingpost

CVSS v3.1 Score 10.0 (Critical)

CWE CWE-288

Bug ID CSCwr96008

Description Web interface authentication bypass due to improper boot process initialization, leading to unauthenticated remote script execution and root access.

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This vulnerability affects on-premises deployments of Cisco Secure FMC Software. There are no workarounds or temporary mitigations available, making it critical for organizations to address this issue promptly. Cisco has confirmed that certain products, including Cloud-Delivered FMC (cdFMC), Secure Firewall Adaptive Security Appliance (ASA) Software, Secure Firewall Threat Defense (FTD) Software, and Security Cloud Control, are not affected by this vulnerability.

As of March 2026, Cisco has not observed any public exploitation of this vulnerability.

Organizations are advised to upgrade their affected FMC systems to a fixed software release immediately, as no alternative workarounds exist. Unpatched systems remain at risk for unauthorized access and potential ransomware deployment.

Cisco provides a Software Checker tool to help security teams determine their exposure. Administrators can use this tool to identify the earliest software version that addresses the vulnerability, ensuring timely updates within their patch management cycles.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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