high
7.8
CWE
20
Advisory Published
Updated

CVE-2019-1687: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software TCP Proxy Denial of Service Vulnerability

First published: Fri May 03 2019(Updated: )

A vulnerability in the TCP proxy functionality for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to restart unexpectedly, resulting in a denial of service (DoS) condition. The vulnerability is due to an error in TCP-based packet inspection, which could cause the TCP packet to have an invalid Layer 2 (L2)-formatted header. An attacker could exploit this vulnerability by sending a crafted TCP packet sequence to the targeted device. A successful exploit could allow the attacker to cause a DoS condition.

Credit: ykramarz@cisco.com ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Adaptive Security Appliance Software<9.4.4.34
Cisco Adaptive Security Appliance Software>=9.5<9.6.4.25
Cisco Adaptive Security Appliance Software>=9.7<9.8.4
Cisco Adaptive Security Appliance Software>=9.9<9.9.2.50
Cisco Adaptive Security Appliance Software>=9.10<9.10.1.17
Cisco Asa 5505
Cisco Asa 5510
Cisco Asa 5512-x
Cisco Asa 5515-x
Cisco Asa 5520
Cisco Asa 5525-x
Cisco Asa 5540
Cisco Asa 5545-x
Cisco Asa 5550
Cisco Asa 5555-x
Cisco Asa 5580
Cisco Asa 5585-x
Cisco Firepower Threat Defense>=6.0.0<6.2.3.12
Cisco Firepower Threat Defense>=6.3.0<6.3.0.3
All of
Any of
Cisco Adaptive Security Appliance Software<9.4.4.34
Cisco Adaptive Security Appliance Software>=9.5<9.6.4.25
Cisco Adaptive Security Appliance Software>=9.7<9.8.4
Cisco Adaptive Security Appliance Software>=9.9<9.9.2.50
Cisco Adaptive Security Appliance Software>=9.10<9.10.1.17
Any of
Cisco Asa 5505
Cisco Asa 5510
Cisco Asa 5512-x
Cisco Asa 5515-x
Cisco Asa 5520
Cisco Asa 5525-x
Cisco Asa 5540
Cisco Asa 5545-x
Cisco Asa 5550
Cisco Asa 5555-x
Cisco Asa 5580
Cisco Asa 5585-x

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Reference Links

Frequently Asked Questions

  • What is the vulnerability ID?

    The vulnerability ID is CVE-2019-1687.

  • What is the severity of CVE-2019-1687?

    The severity of CVE-2019-1687 is high with a CVSS score of 7.5.

  • How does CVE-2019-1687 affect Cisco Adaptive Security Appliance (ASA) Software?

    CVE-2019-1687 affects Cisco Adaptive Security Appliance (ASA) Software versions 9.4.4.34 up to but excluding 9.6.4.25, versions 9.7 up to but excluding 9.8.4, versions 9.9 up to but excluding 9.9.2.50, and versions 9.10 up to but excluding 9.10.1.17.

  • How does CVE-2019-1687 affect Cisco Firepower Threat Defense (FTD) Software?

    CVE-2019-1687 affects Cisco Firepower Threat Defense (FTD) Software versions 6.0.0 up to but excluding 6.2.3.12, and versions 6.3.0 up to but excluding 6.3.0.3.

  • How can I fix CVE-2019-1687?

    To fix CVE-2019-1687, Cisco recommends upgrading to a fixed software release.

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