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5.9
Cisco Firewall Software Allows Malicious File Creation by Authorized Users
CVE-2026-20018
Summary
A security flaw in Cisco's Firewall Management and Threat Defense Software could let authorized users with administrative access create or modify any file on the system, potentially leading to system compromise. This could happen if an attacker tricks the system into writing files outside of its intended directory. Affected users should update their software to the latest version to protect against this vulnerability.
Original title
A vulnerability in the sftunnel functionality of Cisco Secure Firewall Management Center (FMC) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote ...
Original description
A vulnerability in the sftunnel functionality of Cisco Secure Firewall Management Center (FMC) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker with administrative privileges to write arbitrary files as root on the underlying operating system.
This vulnerability is due to insufficient validation of the directory path during file synchronization. An attacker could exploit this vulnerability by crafting a directory path outside of the expected file location. A successful exploit could allow the attacker to create or replace any file on the underlying operating system.
This vulnerability is due to insufficient validation of the directory path during file synchronization. An attacker could exploit this vulnerability by crafting a directory path outside of the expected file location. A successful exploit could allow the attacker to create or replace any file on the underlying operating system.
nvd CVSS3.1
5.9
Vulnerability type
CWE-27
Published: 4 Mar 2026 · Updated: 13 Mar 2026 · First seen: 6 Mar 2026