CVE-2021-34781

Published on: 10/27/2021 12:00:00 AM UTC

Last Modified on: 10/29/2021 02:35:00 PM UTC

CVE-2021-34781 - advisory for cisco-sa-ftd-dos-rUDseW3r

Source: Mitre Source: NIST CVE.ORG Print: PDF PDF
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Certain versions of Firepower Management Center Virtual Appliance from Cisco contain the following vulnerability:

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.

  • CVE-2021-34781 has been assigned by URL Logo [email protected] to track the vulnerability - currently rated as HIGH severity.
  • The Cisco PSIRT is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
  • Affected Vendor/Software: URL Logo Cisco - Cisco Adaptive Security Appliance (ASA) Software version n/a

CVSS3 Score: 7.5 - HIGH

Attack
Vector ⓘ		 Attack
Complexity		 Privileges
Required		 User
Interaction
NETWORK LOW NONE NONE
Scope Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
UNCHANGED NONE NONE HIGH

CVSS2 Score: 7.1 - HIGH

Access
Vector ⓘ		 Access
Complexity		 Authentication
NETWORK MEDIUM NONE
Confidentiality
Impact		 Integrity
Impact		 Availability
Impact
NONE NONE COMPLETE

CVE References

Description Tags ⓘ Link
Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability tools.cisco.com
text/html
 URL Logo CISCO 20211027 Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability
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Known Affected Configurations (CPE V2.3)

Type Vendor Product Version Update Edition Language
ApplicationCiscoFirepower Management Center Virtual Appliance6.3.0AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance6.4.0AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance6.4.0.13AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance6.5.0AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance6.6.0AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance6.7.0.3AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance6.7.1AllAllAll
ApplicationCiscoFirepower Management Center Virtual Appliance7.0.0AllAllAll
ApplicationCiscoFirepower Threat DefenseAllAllAllAll
ApplicationCiscoSourcefire Defense Center6.3.0AllAllAll
ApplicationCiscoSourcefire Defense Center6.4.0AllAllAll
ApplicationCiscoSourcefire Defense Center6.4.0.13AllAllAll
ApplicationCiscoSourcefire Defense Center6.5.0AllAllAll
ApplicationCiscoSourcefire Defense Center6.6.0AllAllAll
ApplicationCiscoSourcefire Defense Center6.7.0.3AllAllAll
ApplicationCiscoSourcefire Defense Center6.7.1AllAllAll
ApplicationCiscoSourcefire Defense Center7.0.0AllAllAll
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.3.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0.13:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.5.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.6.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.0.3:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.1:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:7.0.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.3.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.4.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.4.0.13:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.5.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.6.0:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.7.0.3:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:6.7.1:*:*:*:*:*:*:*:
  • cpe:2.3:a:cisco:sourcefire_defense_center:7.0.0:*:*:*:*:*:*:*:

Social Mentions

Source Title Posted (UTC)
Twitter Icon @CVEreport CVE-2021-34781 : A vulnerability in the processing of SSH connections for multi-instance deployments of Cisco Fir… twitter.com/i/web/status/1… 2021-10-27 19:08:40
Twitter Icon @SystemTek_UK Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability [CVE-2021-34781] systemtek.co.uk/2021/10/cisco-… 2021-10-28 03:46:06
Twitter Icon @6townstechteam Cisco Firepower Threat Defense Software SSH Connections Denial of Service Vulnerability [CVE-2021-34781] systemtek.co.uk/2021/10/cisco-… 2021-10-28 03:46:08
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