CVE-2021-1504
Last modified
CVE-2021-1504 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 1.66% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| 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 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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