CVE-2019-1873: Cisco ASA and FTD Software Cryptographic TLS and SSL Driver Denial of Service Vulnerability
First published: Wed Jul 10 2019(Updated: )
A vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly. The vulnerability is due to incomplete input validation of a Secure Sockets Layer (SSL) or Transport Layer Security (TLS) ingress packet header. An attacker could exploit this vulnerability by sending a crafted TLS/SSL packet to an interface on the targeted device. An exploit could allow the attacker to cause the device to reload, which will result in a denial of service (DoS) condition. Note: Only traffic directed to the affected system can be used to exploit this vulnerability. This vulnerability affects systems configured in routed and transparent firewall mode and in single or multiple context mode. This vulnerability can be triggered by IPv4 and IPv6 traffic. A valid SSL or TLS session is required to exploit this vulnerability.
Credit: ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Asa 5506-x Firmware | =9.6\(4.16\) | |
| Cisco Asa 5506-x Firmware | =9.8\(3.8\) | |
| Cisco ASA 5506-X | ||
| Cisco Asa 5506h-x Firmware | =9.6\(4.16\) | |
| Cisco Asa 5506h-x Firmware | =9.8\(3.8\) | |
| Cisco Asa 5506h-x | ||
| Cisco Asa 5506w-x Firmware | =9.6\(4.16\) | |
| Cisco Asa 5506w-x Firmware | =9.8\(3.8\) | |
| Cisco Asa 5506w-x | ||
| Cisco Asa 5508-x Firmware | =9.6\(4.16\) | |
| Cisco Asa 5508-x Firmware | =9.8\(3.8\) | |
| Cisco Asa 5508-x | ||
| Cisco Asa 5516-x Firmware | =9.6\(4.16\) | |
| Cisco Asa 5516-x Firmware | =9.8\(3.8\) | |
| Cisco Asa 5516-x |
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Reference Links
Frequently Asked Questions
What is CVE-2019-1873?
CVE-2019-1873 is a vulnerability in the cryptographic driver for Cisco Adaptive Security Appliance Software (ASA) and Firepower Threat Defense (FTD) Software that could allow an unauthenticated, remote attacker to cause the device to reboot unexpectedly.
How does CVE-2019-1873 affect Cisco ASA and FTD Software?
The vulnerability in CVE-2019-1873 affects Cisco ASA and FTD Software by causing the device to reboot unexpectedly when exploited by an unauthenticated, remote attacker.
What is the severity of CVE-2019-1873?
CVE-2019-1873 has a severity rating of 8.6 (high).
What is the fix for CVE-2019-1873?
To fix CVE-2019-1873, Cisco has released software updates. Please refer to the Cisco Security Advisory for the specific software versions and instructions.
Where can I find more information about CVE-2019-1873?
You can find more information about CVE-2019-1873 in the following references: [http://www.securityfocus.com/bid/109123](http://www.securityfocus.com/bid/109123) and [https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190710-asa-ftd-dos](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190710-asa-ftd-dos)
- collector/nvd-index
- agent/references
- agent/type
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- agent/severity
- agent/weakness
- agent/title
- agent/last-modified-date
- agent/author
- agent/tags
- agent/description
- agent/first-publish-date
- agent/event
- vendor/cisco
- canonical/cisco asa 5506-x firmware
- version/cisco asa 5506-x firmware/9.6\(4.16\)
- version/cisco asa 5506-x firmware/9.8\(3.8\)
- canonical/cisco asa 5506-x
- canonical/cisco asa 5506h-x firmware
- version/cisco asa 5506h-x firmware/9.6\(4.16\)
- version/cisco asa 5506h-x firmware/9.8\(3.8\)
- canonical/cisco asa 5506h-x
- canonical/cisco asa 5506w-x firmware
- version/cisco asa 5506w-x firmware/9.6\(4.16\)
- version/cisco asa 5506w-x firmware/9.8\(3.8\)
- canonical/cisco asa 5506w-x
- canonical/cisco asa 5508-x firmware
- version/cisco asa 5508-x firmware/9.6\(4.16\)
- version/cisco asa 5508-x firmware/9.8\(3.8\)
- canonical/cisco asa 5508-x
- canonical/cisco asa 5516-x firmware
- version/cisco asa 5516-x firmware/9.6\(4.16\)
- version/cisco asa 5516-x firmware/9.8\(3.8\)
- canonical/cisco asa 5516-x