CVE-2019-1981 MEDIUM

CVE-2019-1981: Cisco Firepower Threat Defense Software NULL Character Obfuscation Detection Bypass Vulnerability

Vendor Cisco
Product Cisco Firepower Threat Defense Software
Weakness CWE-264
Published November 5, 2019
Last update November 19, 2024

CVSS base score

5.8/10
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Confidentiality None
Integrity Low

CVSS vector

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N

What the vulnerability does

01Description

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. 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.

Key dates

02Disclosure timeline

November 5, 2019 CVE published
November 19, 2024 Record updated