Vulnerability Monitor

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CVE-2021-34781

A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on the affected device. This vulnerability is due to a lack of proper error handling when an SSH session fails to be established. An attacker could exploit this vulnerability by sending a high rate of crafted SSH connections to the instance. A successful exploit could allow the attacker to cause resource exhaustion, which causes a DoS condition on the affected device. The device must be manually reloaded to recover.

Published

2021-10-27T19:15:08.233

Last Modified

2024-11-21T06:11:11.290

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 8.6 (HIGH)

CVSSv2 Vector

AV:N/AC:M/Au:N/C:N/I:N/A:C

  • Access Vector: NETWORK
  • Access Complexity: MEDIUM
  • Authentication: NONE
  • Confidentiality Impact: NONE
  • Integrity Impact: NONE
  • Availability Impact: COMPLETE
Exploitability Score

8.6

Impact Score

6.9

Weaknesses
  • Type: Secondary
    CWE-119
  • Type: Primary
    CWE-755
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application cisco firepower_management_center_virtual_appliance 6.3.0 Yes
Application cisco firepower_management_center_virtual_appliance 6.4.0 Yes
Application cisco firepower_management_center_virtual_appliance 6.4.0.13 Yes
Application cisco firepower_management_center_virtual_appliance 6.5.0 Yes
Application cisco firepower_management_center_virtual_appliance 6.6.0 Yes
Application cisco firepower_management_center_virtual_appliance 6.7.0.3 Yes
Application cisco firepower_management_center_virtual_appliance 6.7.1 Yes
Application cisco firepower_management_center_virtual_appliance 7.0.0 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
Application cisco firepower_threat_defense < 7.0.1 Yes
Application cisco sourcefire_defense_center 6.3.0 Yes
Application cisco sourcefire_defense_center 6.4.0 Yes
Application cisco sourcefire_defense_center 6.4.0.13 Yes
Application cisco sourcefire_defense_center 6.5.0 Yes
Application cisco sourcefire_defense_center 6.6.0 Yes
Application cisco sourcefire_defense_center 6.7.0.3 Yes
Application cisco sourcefire_defense_center 6.7.1 Yes
Application cisco sourcefire_defense_center 7.0.0 Yes
References