Resource exhaustion in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2019-1873

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Main Vulnerability Database Vulnerabilities #VU19190

Resource exhaustion in Cisco Firewall Threat Defense (FTD) and Cisco Adaptive Security Appliance (ASA) - CVE-2019-1873

Published: July 16, 2019 / Updated: July 18, 2019


Vulnerability identifier: #VU19190
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2019-1873
CWE-ID: CWE-400
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. A remote attacker can send a specially crafted TLS/SSL packet to an interface on the targeted device, cause the device to reload and perform a denial of service (DoS) attack.

This vulnerability affects the following products if they are running a vulnerable release of Cisco ASA Software or FTD Software:

  • ASA 5506-X
  • ASA 5506-X with FirePOWER Services
  • ASA 5506H-X
  • ASA 5506H-X with FirePOWER Services
  • ASA 5506W-X
  • ASA 5506W-X with FirePOWER Services
  • ASA 5508-X
  • ASA 5508-X with FirePOWER Services
  • ASA 5516-X
  • ASA 5516-X with FirePOWER Services


Affected software

Cisco Firewall Threat Defense (FTD)
Cisco Adaptive Security Appliance (ASA)

How to mitigate CVE-2019-1873

Install updates from vendor's website.

Cisco Firewall Threat Defense (FTD) - addressed in versions 6.2.3.13, 6.3.0.4, 6.4.0.2
Cisco Adaptive Security Appliance (ASA) - addressed in versions 9.4.4.36, 9.6.4.29, 9.8.4.3, 9.9.2.52, 9.10.1.22, 9.12.2

External References

Related Security Bulletins