CVE-2021-1501
Last modified
CVE-2021-1501 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A vulnerability in the SIP inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition.The vulnerability is due to a crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. EPSS estimates a 1.34% chance of exploitation in the next 30 days.
Description
A vulnerability in the SIP inspection engine of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a crash and reload of an affected device, resulting in a denial of service (DoS) condition.The vulnerability is due to a crash that occurs during a hash lookup for a SIP pinhole connection. An attacker could exploit this vulnerability by sending crafted SIP traffic through an affected device. A successful exploit could allow the attacker to cause a crash and reload of the affected device.
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 | >= 6.2.2, < 6.4.0.12 |
| Cisco | Firepower Threat Defense | >= 6.5.0, < 6.6.4 |
| Cisco | Firepower Threat Defense | >= 6.7.0, < 6.7.0.2 |
| Cisco | Adaptive Security Appliance Software | >= 9.8, < 9.8.4.34 |
| Cisco | Adaptive Security Appliance Software | >= 9.9, < 9.9.2.85 |
| Cisco | Adaptive Security Appliance Software | >= 9.10, < 9.12.4.18 |
| Cisco | Adaptive Security Appliance Software | >= 9.13, < 9.13.1.21 |
| Cisco | Adaptive Security Appliance Software | >= 9.14, < 9.14.2.13 |
| Cisco | Adaptive Security Appliance Software | >= 9.15, < 9.15.1.15 |
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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