CVE-2021-34793
A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent …
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cisco | Adaptive Security Appliance | before 9.8.4.40 |
| Cisco | Secure Firewall Threat Defense | before 6.4.0.13 from 6.5.0 before 6.6.5 from 6.7.0 before 6.7.0.3 |
| Cisco | Adaptive Security Appliance Software | from 9.9.0 before 9.12.4.29 from 9.13.0 before 9.14.3.9 from 9.15.0 before 9.15.1.17 from 9.16.0 before 9.16.2.3 |
| Cisco | Asa 5512-X Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5505 Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5515-X Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5525-X Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5545-X Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5555-X Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5580 Firmware | Version 009.008\(004.025\) |
| Cisco | Asa 5585-X Firmware | Version 009.008\(004.025\) |