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 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.

• Cisco Adaptive Security Appliance

  APP
  Cisco
  < 9.8.4.40

• Cisco Adaptive Security Appliance Software

  OS
  Cisco
  9.15.0 – 9.15.1.17 (bez)9.16.0 – 9.16.2.3 (bez)9.9.0 – 9.12.4.29 (bez)9.13.0 – 9.14.3.9 (bez)

• Cisco Asa 5505

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5505 Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5512 X

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5512 X Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5515 X

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5515 X Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5525 X

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5525 X Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5545 X

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5545 X Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5555 X

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5555 X Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5580

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5580 Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Asa 5585 X

  HW
  Cisco
  wszystkie wersje

• Cisco Asa 5585 X Firmware

  OS
  Cisco
  009.008\(004.025\)

• Cisco Firepower Threat Defense

  APP
  Cisco
  < 6.4.0.136.5.0 – 6.6.5 (bez)6.7.0 – 6.7.0.3 (bez)