A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. This vulnerability is due to incorrect handling of certain TCP segments when the affected device is operating in transparent mode. An attacker could exploit this vulnerability by sending a crafted TCP segment through an affected device. A successful exploit could allow the attacker to poison the MAC address tables in adjacent devices, resulting in network disruption.
This vulnerability carries a HIGH severity rating with a CVSS v3.1 score of 8.6, 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 availability (service disruption) for affected systems. Impacting 19 products from cisco, from cisco, from cisco and 16 others, organizations running these solutions should prioritize assessment and patching.
Reported in 2021, 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.
2021-10-27T19:15:08.563
2024-11-21T06:11:13.063
Modified
CVSSv3.1: 8.6 (HIGH)
AV:N/AC:L/Au:N/C:N/I:N/A:P
10.0
2.9
| Type | Vendor | Product | Version/Range | Vulnerable? |
|---|---|---|---|---|
| Application | cisco | adaptive_security_appliance | < 9.8.4.40 | Yes |
| Application | cisco | firepower_threat_defense | < 6.4.0.13 | Yes |
| Application | cisco | firepower_threat_defense | < 6.6.5 | Yes |
| Application | cisco | firepower_threat_defense | < 6.7.0.3 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.12.4.29 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.14.3.9 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.15.1.17 | Yes |
| Operating System | cisco | adaptive_security_appliance_software | < 9.16.2.3 | Yes |
| Operating System | cisco | asa_5512-x_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5512-x | - | No |
| Operating System | cisco | asa_5505_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5505 | - | No |
| Operating System | cisco | asa_5515-x_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5515-x | - | No |
| Operating System | cisco | asa_5525-x_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5525-x | - | No |
| Operating System | cisco | asa_5545-x_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5545-x | - | No |
| Operating System | cisco | asa_5555-x_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5555-x | - | No |
| Operating System | cisco | asa_5580_firmware | 009.008\(004.025\) | Yes |
| Hardware | cisco | asa_5580 | - | No |
| Operating System | cisco | asa_5585-x_firmware | 009.008\(004.025\) | 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.