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.
The product establishes a communication channel with an endpoint and receives a message from that endpoint, but it does not sufficiently ensure that the message was not modified during transmission.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Adaptive_security_appliance | Cisco | * | 9.8.4.40 (excluding) |
| Firepower_threat_defense | Cisco | * | 6.4.0.13 (excluding) |
| Firepower_threat_defense | Cisco | 6.5.0 (including) | 6.6.5 (excluding) |
| Firepower_threat_defense | Cisco | 6.7.0 (including) | 6.7.0.3 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.9.0 (including) | 9.12.4.29 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.13.0 (including) | 9.14.3.9 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.15.0 (including) | 9.15.1.17 (excluding) |
| Adaptive_security_appliance_software | Cisco | 9.16.0 (including) | 9.16.2.3 (excluding) |