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[email protected]CVE-2021-34781

HistoryOct 27, 2021 - 7:15 p.m.

CVE-2021-34781

2021-10-2719:15:08

CWE-119

CWE-755

[email protected]

web.nvd.nist.gov

cve-2021-34781

vulnerability

cisco

ftd

dos

ssh

nvd

security

7.1 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

8.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

7.5 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

49.8%

JSON

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.

Affected configurations

NVD

Node

ciscofirepower_management_center_virtual_applianceMatch6.3.0

ciscofirepower_management_center_virtual_applianceMatch6.4.0

ciscofirepower_management_center_virtual_applianceMatch6.4.0.13

ciscofirepower_management_center_virtual_applianceMatch6.5.0

ciscofirepower_management_center_virtual_applianceMatch6.6.0

ciscofirepower_management_center_virtual_applianceMatch6.7.0.3

ciscofirepower_management_center_virtual_applianceMatch6.7.1

ciscofirepower_management_center_virtual_applianceMatch7.0.0

ciscofirepower_threat_defenseRange6.3.0–6.4.0.13

ciscofirepower_threat_defenseRange6.5.0–6.6.5

ciscofirepower_threat_defenseRange6.7.0–6.7.0.3

ciscofirepower_threat_defenseRange7.0.0–7.0.1

ciscosourcefire_defense_centerMatch6.3.0

ciscosourcefire_defense_centerMatch6.4.0

ciscosourcefire_defense_centerMatch6.4.0.13

ciscosourcefire_defense_centerMatch6.5.0

ciscosourcefire_defense_centerMatch6.6.0

ciscosourcefire_defense_centerMatch6.7.0.3

ciscosourcefire_defense_centerMatch6.7.1

ciscosourcefire_defense_centerMatch7.0.0

CPENameOperatorVersion
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.3.0
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.4.0
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.4.0.13
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.5.0
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.6.0
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.7.0.3
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq6.7.1
cisco:firepower_management_center_virtual_appliancecisco firepower management center virtual applianceeq7.0.0
cisco:firepower_threat_defensecisco firepower threat defenselt6.4.0.13
cisco:firepower_threat_defensecisco firepower threat defenselt6.6.5

CPE	Name	Operator	Version
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.3.0
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.4.0
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.4.0.13
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.5.0
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.6.0
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.7.0.3
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	6.7.1
cisco:firepower_management_center_virtual_appliance	cisco firepower management center virtual appliance	eq	7.0.0
cisco:firepower_threat_defense	cisco firepower threat defense	lt	6.4.0.13
cisco:firepower_threat_defense	cisco firepower threat defense	lt	6.6.5

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CNA Affected

[
  {
    "product": "Cisco Adaptive Security Appliance (ASA) Software ",
    "vendor": "Cisco",
    "versions": [
      {
        "status": "affected",
        "version": "n/a"
      }
    ]
  }
]

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-rUDseW3r

7.1 High

CVSS2

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

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

8.6 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

7.5 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

49.8%

JSON

Related for CVE-2021-34781

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