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[email protected]NVD: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

cisco

ftd software

ssh

vulnerability

denial of service

resource exhaustion

dos_condition

CVSS2

7.1

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.002

Percentile

52.8%

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

VendorProductVersionCPE
ciscofirepower_management_center_virtual_appliance6.3.0cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.3.0:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance6.4.0cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance6.4.0.13cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0.13:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance6.5.0cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.5.0:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance6.6.0cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.6.0:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance6.7.0.3cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.0.3:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance6.7.1cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.1:*:*:*:*:*:*:*
ciscofirepower_management_center_virtual_appliance7.0.0cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:7.0.0:*:*:*:*:*:*:*
ciscofirepower_threat_defense*cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
ciscosourcefire_defense_center6.3.0cpe:2.3:a:cisco:sourcefire_defense_center:6.3.0:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cisco	firepower_management_center_virtual_appliance	6.3.0	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.3.0:::::::*
cisco	firepower_management_center_virtual_appliance	6.4.0	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0:::::::*
cisco	firepower_management_center_virtual_appliance	6.4.0.13	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.4.0.13:::::::*
cisco	firepower_management_center_virtual_appliance	6.5.0	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.5.0:::::::*
cisco	firepower_management_center_virtual_appliance	6.6.0	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.6.0:::::::*
cisco	firepower_management_center_virtual_appliance	6.7.0.3	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.0.3:::::::*
cisco	firepower_management_center_virtual_appliance	6.7.1	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:6.7.1:::::::*
cisco	firepower_management_center_virtual_appliance	7.0.0	cpe:2.3:a:cisco:firepower_management_center_virtual_appliance:7.0.0:::::::*
cisco	firepower_threat_defense	*	cpe:2.3:a:cisco:firepower_threat_defense::::::::
cisco	sourcefire_defense_center	6.3.0	cpe:2.3:a:cisco:sourcefire_defense_center:6.3.0:::::::*

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References

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

CVSS2

7.1

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

CVSS3

7.5

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

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

EPSS

0.002

Percentile

52.8%

JSON

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