What’s Vulnerable › Vulnerabilities
CVE-2019-1981: Cisco Firepower Threat Defense Software NULL Character Obfuscation Detection Bypass Vulnerability
- Severity: medium (CVSS 5.8 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2019-11-05 · updated 2026-08-11
- Weakness: CWE-264
Description
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: all versions
- Cisco Firepower Management Center: from 2.9.12 through 2.9.12.15; from 2.9.13 through 2.9.13.6; from 2.9.14.0 through 2.9.14.5; 2.9.15, 2.9.16
- Cisco Firepower Threat Defense Software: all versions
References
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190816-ftd-null
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190816-ftd-null
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