CVE-2021-1504: Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Web Services VPN Denial of Service Vulnerabilities
First published: Thu Apr 29 2021(Updated: )
Multiple vulnerabilities in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. These vulnerabilities are due to lack of proper input validation of the HTTPS request. An attacker could exploit these vulnerabilities by sending a crafted HTTPS request to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.
Credit: ykramarz@cisco.com ykramarz@cisco.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Cisco Firepower Threat Defense | >=6.5.0<6.6.4 | |
| Cisco Firepower Threat Defense | >=6.7.0<6.7.0.1 | |
| Cisco Adaptive Security Appliance Software | >=9.7<9.8.4.35 | |
| Cisco Adaptive Security Appliance Software | >=9.9<9.9.2.85 | |
| Cisco Adaptive Security Appliance Software | >=9.10<9.12.4.10 | |
| Cisco Adaptive Security Appliance Software | >=9.13<9.13.1.21 | |
| Cisco Adaptive Security Appliance Software | >=9.14<9.14.2.4 | |
| Cisco Adaptive Security Appliance Software | >=9.15<9.15.1.7 |
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Reference Links
Frequently Asked Questions
What is CVE-2021-1504?
CVE-2021-1504 is a vulnerability in Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device.
What is the severity of CVE-2021-1504?
The severity of CVE-2021-1504 is high, with a severity value of 7.5.
Which software versions are affected by CVE-2021-1504?
Cisco Adaptive Security Appliance Software versions 9.7 to 9.14, Cisco Firepower Threat Defense versions 6.5 to 6.6.4, and Cisco Firepower Threat Defense versions 6.7 to 6.7.0.1 are affected by CVE-2021-1504.
How can an attacker exploit CVE-2021-1504?
An attacker can exploit CVE-2021-1504 by sending malicious traffic to an affected device, which can cause a denial of service (DoS) condition.
Is there a fix available for CVE-2021-1504?
Yes, Cisco has released software updates to address CVE-2021-1504. It is recommended to update to the latest software version provided by Cisco.
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