Vulnerability Monitor

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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.

Published

2021-10-27T19:15:08.563

Last Modified

2024-11-21T06:11:13.063

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.6 (HIGH)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

  • Access Vector: NETWORK
  • Access Complexity: LOW
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: PARTIAL
Exploitability Score

10.0

Impact Score

2.9

Weaknesses
  • Type: Secondary
    CWE-924
  • Type: Primary
    CWE-924
Affected Vendors & Products
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
References