Cisco Firepower Threat Defense ASA Software Improper Authentication Vulnerability


A vulnerability in the normalization functionality of Cisco Firepower Threat Defense Software, Cisco FirePOWER Services Software for ASA, and Cisco Firepower Management Center Software could allow an unauthenticated, remote attacker to bypass filtering protections. The vulnerability is due to insufficient normalization of a text-based payload. 


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An attacker could exploit this vulnerability by sending traffic that contains specifically obfuscated payloads through an affected device. An exploit could allow the attacker to bypass filtering and deliver malicious payloads to protected systems that would otherwise be blocked.


Vulnerable Systems:

Cisco Firepower Threat Defense Software

Cisco FirePOWER Services Software for ASA

Cisco Firepower Management Center Software 


CVE Information:



Disclosure Timeline:
Published Date:11/5/2019