CVE-2018-15388: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software WebVPN Denial of Service Vulnerability
First published: Fri May 03 2019(Updated: )
A vulnerability in the WebVPN login process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause increased CPU utilization on an affected device. The vulnerability is due to excessive processing load for existing WebVPN login operations. An attacker could exploit this vulnerability by sending multiple WebVPN login requests to the device. A successful exploit could allow the attacker to increase CPU load on the device, resulting in a denial of service (DoS) condition.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How 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 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 | <6.2.3.12 |
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Reference Links
Frequently Asked Questions
What is CVE-2018-15388?
CVE-2018-15388 is a vulnerability in the WebVPN login process of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software.
How does CVE-2018-15388 impact the affected devices?
CVE-2018-15388 could allow an unauthenticated, remote attacker to cause increased CPU utilization on an affected device.
What is the severity of CVE-2018-15388?
CVE-2018-15388 has a severity rating of 8.6 (high).
How can I fix CVE-2018-15388?
There is currently no fixed software available for CVE-2018-15388. It is advised to follow the recommended mitigations provided by Cisco in their advisory.
Where can I find more information about CVE-2018-15388?
You can find more information about CVE-2018-15388 in the Cisco Security Advisory, which can be accessed at the following link: [Cisco Security Advisory - CVE-2018-15388](https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-sd-cpu-dos)
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- canonical/cisco asa 5505
- canonical/cisco asa 5510
- canonical/cisco asa 5512-x
- canonical/cisco asa 5515-x
- canonical/cisco asa 5520
- canonical/cisco asa 5525-x
- canonical/cisco asa 5540
- canonical/cisco asa 5545-x
- canonical/cisco asa 5550
- canonical/cisco asa 5555-x
- canonical/cisco asa 5580
- canonical/cisco asa 5585-x
- canonical/cisco firepower threat defense