A vulnerability in how Cisco Firepower Threat Defense (FTD) Software handles session timeouts for management connections could allow an unauthenticated, remote attacker to cause a buildup of remote management connections to an affected device, which could result in a denial of service (DoS) condition. The vulnerability exists because the default session timeout period for specific to-the-box remote management connections is too long. An attacker could exploit this vulnerability by sending a large and sustained number of crafted remote management connections to an affected device, resulting in a buildup of those connections over time. A successful exploit could allow the attacker to cause the remote management interface or Cisco Firepower Device Manager (FDM) to stop responding and cause other management functions to go offline, resulting in a DoS condition. The user traffic that is flowing through the device would not be affected, and the DoS condition would be isolated to remote management only.
This vulnerability carries a MEDIUM severity rating with a CVSS v3.1 score of 5.3, indicating it can be exploited remotely over the network with relatively low complexity without requiring user interaction and does not require pre-existing privileges . The vulnerability impacts and limited availability for affected systems. Impacting 25 products from cisco, from cisco, from cisco and 22 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2020, this vulnerability emerged during an era marked by increased sophistication in supply chain attacks, cloud infrastructure vulnerabilities, and software-as-a-service (SaaS) security challenges. Security practices during this period emphasized zero-trust architectures, container security, and API protection.
2020-05-06T17:15:12.150
2026-06-17T03:17:35.620
Modified
CVSSv3.1: 5.3 (MEDIUM)
AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | cisco | firepower_threat_defense | < 6.4.0.9 | Yes |
| Application | cisco | firepower_threat_defense | < 6.5.0.5 | Yes |
| Operating System | cisco | asa_5505_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5505_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5505 | - | No |
| Operating System | cisco | asa_5510_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5510_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5510 | - | No |
| Operating System | cisco | asa_5512-x_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5512-x_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5512-x | - | No |
| Operating System | cisco | asa_5515-x_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5515-x_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5515-x | - | No |
| Operating System | cisco | asa_5520_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5520_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5520 | - | No |
| Operating System | cisco | asa_5525-x_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5525-x_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5525-x | - | No |
| Operating System | cisco | asa_5540_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5540_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5540 | - | No |
| Operating System | cisco | asa_5545-x_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5545-x_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5545-x | - | No |
| Operating System | cisco | asa_5550_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5550_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5550 | - | No |
| Operating System | cisco | asa_5555-x_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5555-x_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5555-x | - | No |
| Operating System | cisco | asa_5580_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5580_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5580 | - | No |
| Operating System | cisco | asa_5585-x_firmware | 9.8\(3\) | Yes |
| Operating System | cisco | asa_5585-x_firmware | 101.6\(1.96\) | Yes |
| Hardware | cisco | asa_5585-x | - | No |
SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For cisco's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.