CVE-2019-1981: Cisco Firepower Services Software For ASA

Medium severity, CVSS 5.8. EPSS: 1% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco Firepower Services Software For ASA: any version
• Cisco Secure Firewall Management Center: from 2.9.12, up to and including 2.9.12.15; from 2.9.13, up to and including 2.9.13.6; from 2.9.14.0, up to and including 2.9.14.5; version 2.9.15 only; version 2.9.16 only
• Cisco Secure Firewall Threat Defense: any version

Published 2019-11-05. Last modified 2026-08-11.