Details of VAR-202110-1395

ID

VAR-202110-1395

CVE

CVE-2021-34781

TITLE

Cisco Firepower Threat Defense Software Vulnerability in handling exceptional conditions in

Trust: 0.8

sources: JVNDB: JVNDB-2021-014288

DESCRIPTION

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

Trust: 1.71

sources: NVD: CVE-2021-34781 // JVNDB: JVNDB-2021-014288 // VULHUB: VHN-395023

AFFECTED PRODUCTS

vendor:	cisco	model:	firepower threat defense	scope:	gte	version:	7.0.0	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	lt	version:	7.0.1	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	lt	version:	6.7.0.3	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.3.0	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	lt	version:	6.4.0.13	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.3.0	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	gte	version:	6.5.0	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	lt	version:	6.6.5	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	gte	version:	6.7.0	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	7.0.0	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	7.0.0	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.7.0.3	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.7.0.3	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.4.0.13	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.4.0	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.4.0	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.4.0.13	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.5.0	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.6.0	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.6.0	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.5.0	Trust: 1.0
vendor:	cisco	model:	firepower threat defense	scope:	gte	version:	6.3.0	Trust: 1.0
vendor:	cisco	model:	sourcefire defense center	scope:	eq	version:	6.7.1	Trust: 1.0
vendor:	cisco	model:	firepower management center virtual appliance	scope:	eq	version:	6.7.1	Trust: 1.0
vendor:	シスコシステムズ	model:	cisco firepower threat defense ソフトウェア	scope:	-	version:	-	Trust: 0.8
vendor:	シスコシステムズ	model:	cisco firepower management center virtual appliance	scope:	-	version:	-	Trust: 0.8
vendor:	シスコシステムズ	model:	cisco sourcefire defense center	scope:	-	version:	-	Trust: 0.8

sources: JVNDB: JVNDB-2021-014288 // NVD: CVE-2021-34781

CVSS

SEVERITY

CVSSV2

CVSSV3

nvd@nist.gov:	CVE-2021-34781
value:	HIGH
Trust: 1.0
ykramarz@cisco.com:	CVE-2021-34781
value:	HIGH
Trust: 1.0
NVD:	CVE-2021-34781
value:	HIGH
Trust: 0.8
CNNVD:	CNNVD-202110-2016
value:	HIGH
Trust: 0.6
VULHUB:	VHN-395023
value:	HIGH
Trust: 0.1

nvd@nist.gov:	CVE-2021-34781
severity:	HIGH
baseScore:	7.1
vectorString:	AV:N/AC:M/AU:N/C:N/I:N/A:C
accessVector:	NETWORK
accessComplexity:	MEDIUM
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	COMPLETE
exploitabilityScore:	8.6
impactScore:	6.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 1.8
VULHUB:	VHN-395023
severity:	HIGH
baseScore:	7.1
vectorString:	AV:N/AC:M/AU:N/C:N/I:N/A:C
accessVector:	NETWORK
accessComplexity:	MEDIUM
authentication:	NONE
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	COMPLETE
exploitabilityScore:	8.6
impactScore:	6.9
acInsufInfo:	NONE
obtainAllPrivilege:	NONE
obtainUserPrivilege:	NONE
obtainOtherPrivilege:	NONE
userInteractionRequired:	NONE
version:	2.0
Trust: 0.1

nvd@nist.gov:	CVE-2021-34781
baseSeverity:	HIGH
baseScore:	7.5
vectorString:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	3.9
impactScore:	3.6
version:	3.1
Trust: 1.0
ykramarz@cisco.com:	CVE-2021-34781
baseSeverity:	HIGH
baseScore:	8.6
vectorString:	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	CHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	3.9
impactScore:	4.0
version:	3.1
Trust: 1.0
NVD:	CVE-2021-34781
baseSeverity:	HIGH
baseScore:	7.5
vectorString:	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
attackVector:	NETWORK
attackComplexity:	LOW
privilegesRequired:	NONE
userInteraction:	NONE
scope:	UNCHANGED
confidentialityImpact:	NONE
integrityImpact:	NONE
availabilityImpact:	HIGH
exploitabilityScore:	NONE
impactScore:	NONE
version:	3.0
Trust: 0.8

sources: VULHUB: VHN-395023 // JVNDB: JVNDB-2021-014288 // CNNVD: CNNVD-202110-2016 // NVD: CVE-2021-34781 // NVD: CVE-2021-34781

PROBLEMTYPE DATA

problemtype:	CWE-755	Trust: 1.1
problemtype:	CWE-119	Trust: 1.0
problemtype:	Improper handling in exceptional conditions (CWE-755) [NVD evaluation ]	Trust: 0.8

sources: VULHUB: VHN-395023 // JVNDB: JVNDB-2021-014288 // NVD: CVE-2021-34781

TYPE

buffer error

Trust: 0.6

sources: CNNVD: CNNVD-202110-2016

PATCH

title:	cisco-sa-ftd-dos-rUDseW3r	url:	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ftd-dos-rUDseW3r	Trust: 0.8
title:	Cisco Firepower Threat Defense Buffer error vulnerability fix	url:	http://www.cnnvd.org.cn/web/xxk/bdxqById.tag?id=167564	Trust: 0.6

sources: JVNDB: JVNDB-2021-014288 // CNNVD: CNNVD-202110-2016

EXTERNAL IDS

db:	NVD	id:	CVE-2021-34781	Trust: 3.3
db:	JVNDB	id:	JVNDB-2021-014288	Trust: 0.8
db:	CNNVD	id:	CNNVD-202110-2016	Trust: 0.7
db:	AUSCERT	id:	ESB-2021.3597	Trust: 0.6
db:	CS-HELP	id:	SB2021102910	Trust: 0.6
db:	VULHUB	id:	VHN-395023	Trust: 0.1

sources: VULHUB: VHN-395023 // JVNDB: JVNDB-2021-014288 // CNNVD: CNNVD-202110-2016 // NVD: CVE-2021-34781

REFERENCES

url:	https://tools.cisco.com/security/center/content/ciscosecurityadvisory/cisco-sa-ftd-dos-rudsew3r	Trust: 2.3
url:	https://nvd.nist.gov/vuln/detail/cve-2021-34781	Trust: 1.4
url:	https://www.cybersecurity-help.cz/vdb/sb2021102910	Trust: 0.6
url:	https://www.auscert.org.au/bulletins/esb-2021.3597	Trust: 0.6

sources: VULHUB: VHN-395023 // JVNDB: JVNDB-2021-014288 // CNNVD: CNNVD-202110-2016 // NVD: CVE-2021-34781

SOURCES

db:	VULHUB	id:	VHN-395023
db:	JVNDB	id:	JVNDB-2021-014288
db:	CNNVD	id:	CNNVD-202110-2016
db:	NVD	id:	CVE-2021-34781

LAST UPDATE DATE

2024-08-14T13:53:52.502000+00:00

SOURCES UPDATE DATE

db:	VULHUB	id:	VHN-395023	date:	2021-10-29T00:00:00
db:	JVNDB	id:	JVNDB-2021-014288	date:	2022-10-12T07:17:00
db:	CNNVD	id:	CNNVD-202110-2016	date:	2021-11-01T00:00:00
db:	NVD	id:	CVE-2021-34781	date:	2023-11-07T03:36:23.920

SOURCES RELEASE DATE

db:	VULHUB	id:	VHN-395023	date:	2021-10-27T00:00:00
db:	JVNDB	id:	JVNDB-2021-014288	date:	2022-10-12T00:00:00
db:	CNNVD	id:	CNNVD-202110-2016	date:	2021-10-27T00:00:00
db:	NVD	id:	CVE-2021-34781	date:	2021-10-27T19:15:08.233