CVE-2019-1687 : A vulnerability in the TCP proxy functionality for Cisco Adaptive Security Appli

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.

Published 2019-05-03 15:29:01

Updated 2023-08-15 15:24:56

Source Cisco Systems, Inc.

View at NVD, CVE.org

Vulnerability category: Input validationDenial of service

Products affected by CVE-2019-1687

Cisco » Adaptive Security Appliance Software
Versions before (<) 9.4.4.34
cpe:2.3:a:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asa 5505 » Version: N/A
When used together with: Cisco » Asa 5510 » Version: N/A
When used together with: Cisco » Asa 5512-x » Version: N/A
When used together with: Cisco » Asa 5515-x » Version: N/A
When used together with: Cisco » Asa 5520 » Version: N/A
When used together with: Cisco » Asa 5525-x » Version: N/A
When used together with: Cisco » Asa 5540 » Version: N/A
When used together with: Cisco » Asa 5545-x » Version: N/A
When used together with: Cisco » Asa 5550 » Version: N/A
When used together with: Cisco » Asa 5555-x » Version: N/A
When used together with: Cisco » Asa 5580 » Version: N/A
When used together with: Cisco » Asa 5585-x » Version: N/A
Cisco » Adaptive Security Appliance Software
Versions from including (>=) 9.9 and before (<) 9.9.2.50
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asa 5505 » Version: N/A
When used together with: Cisco » Asa 5510 » Version: N/A
When used together with: Cisco » Asa 5512-x » Version: N/A
When used together with: Cisco » Asa 5515-x » Version: N/A
When used together with: Cisco » Asa 5520 » Version: N/A
When used together with: Cisco » Asa 5525-x » Version: N/A
When used together with: Cisco » Asa 5540 » Version: N/A
When used together with: Cisco » Asa 5545-x » Version: N/A
When used together with: Cisco » Asa 5550 » Version: N/A
When used together with: Cisco » Asa 5555-x » Version: N/A
When used together with: Cisco » Asa 5580 » Version: N/A
When used together with: Cisco » Asa 5585-x » Version: N/A
Cisco » Adaptive Security Appliance Software
Versions from including (>=) 9.10 and before (<) 9.10.1.17
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asa 5505 » Version: N/A
When used together with: Cisco » Asa 5510 » Version: N/A
When used together with: Cisco » Asa 5512-x » Version: N/A
When used together with: Cisco » Asa 5515-x » Version: N/A
When used together with: Cisco » Asa 5520 » Version: N/A
When used together with: Cisco » Asa 5525-x » Version: N/A
When used together with: Cisco » Asa 5540 » Version: N/A
When used together with: Cisco » Asa 5545-x » Version: N/A
When used together with: Cisco » Asa 5550 » Version: N/A
When used together with: Cisco » Asa 5555-x » Version: N/A
When used together with: Cisco » Asa 5580 » Version: N/A
When used together with: Cisco » Asa 5585-x » Version: N/A
Cisco » Adaptive Security Appliance Software
Versions from including (>=) 9.7 and before (<) 9.8.4
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asa 5505 » Version: N/A
When used together with: Cisco » Asa 5510 » Version: N/A
When used together with: Cisco » Asa 5512-x » Version: N/A
When used together with: Cisco » Asa 5515-x » Version: N/A
When used together with: Cisco » Asa 5520 » Version: N/A
When used together with: Cisco » Asa 5525-x » Version: N/A
When used together with: Cisco » Asa 5540 » Version: N/A
When used together with: Cisco » Asa 5545-x » Version: N/A
When used together with: Cisco » Asa 5550 » Version: N/A
When used together with: Cisco » Asa 5555-x » Version: N/A
When used together with: Cisco » Asa 5580 » Version: N/A
When used together with: Cisco » Asa 5585-x » Version: N/A
Cisco » Adaptive Security Appliance Software
Versions from including (>=) 9.5 and before (<) 9.6.4.25
cpe:2.3:o:cisco:adaptive_security_appliance_software:*:*:*:*:*:*:*:*
Matching versions
When used together with: Cisco » Asa 5505 » Version: N/A
When used together with: Cisco » Asa 5510 » Version: N/A
When used together with: Cisco » Asa 5512-x » Version: N/A
When used together with: Cisco » Asa 5515-x » Version: N/A
When used together with: Cisco » Asa 5520 » Version: N/A
When used together with: Cisco » Asa 5525-x » Version: N/A
When used together with: Cisco » Asa 5540 » Version: N/A
When used together with: Cisco » Asa 5545-x » Version: N/A
When used together with: Cisco » Asa 5550 » Version: N/A
When used together with: Cisco » Asa 5555-x » Version: N/A
When used together with: Cisco » Asa 5580 » Version: N/A
When used together with: Cisco » Asa 5585-x » Version: N/A
Cisco » Firepower Threat Defense
Versions from including (>=) 6.0.0 and before (<) 6.2.3.12
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Matching versions
Cisco » Firepower Threat Defense
Versions from including (>=) 6.3.0 and before (<) 6.3.0.3
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
Matching versions

Exploit prediction scoring system (EPSS) score for CVE-2019-1687

EPSS FAQ

0.09%

Probability of exploitation activity in the next 30 days EPSS Score History

~ 40 %

Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2019-1687

Base Score	Base Severity	CVSS Vector	Exploitability Score	Impact Score	Score Source
7.8	HIGH	AV:N/AC:L/Au:N/C:N/I:N/A:C	10.0	6.9	NIST
Access Vector: Network Access Complexity: Low Authentication: None Confidentiality Impact: None Integrity Impact: None Availability Impact: Complete
6.8	MEDIUM	CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:N/A:H	2.2	4.0	Cisco Systems, Inc.
Attack Vector: Network Attack Complexity: High Privileges Required: None User Interaction: None Scope: Changed Confidentiality: None Integrity: None Availability: High
7.5	HIGH	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	3.9	3.6	NIST
Attack Vector: Network Attack Complexity: Low Privileges Required: None User Interaction: None Scope: Unchanged Confidentiality: None Integrity: None Availability: High

CWE ids for CVE-2019-1687

CWE-20 Improper Input Validation

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
Assigned by:
- nvd@nist.gov (Primary)
- ykramarz@cisco.com (Secondary)

References for CVE-2019-1687

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-asa-ftdtcp-dos

Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software TCP Proxy Denial of Service Vulnerability
Vendor Advisory
http://www.securityfocus.com/bid/108176

Multiple Cisco Products CVE-2019-1687 Denial of Service Vulnerability
Broken Link;Third Party Advisory;VDB Entry

Jump to

Vulnerability Details : CVE-2019-1687

Products affected by CVE-2019-1687

Exploit prediction scoring system (EPSS) score for CVE-2019-1687

CVSS scores for CVE-2019-1687

CWE ids for CVE-2019-1687

References for CVE-2019-1687