CVE-2021-34793

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

Last Modified on: 10/29/2021 02:12:00 AM UTC

CVE-2021-34793 - advisory for cisco-sa-asa-ftd-dos-JxYWMJyL

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

Certain versions of Adaptive Security Appliance from Cisco contain the following vulnerability:

A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and Firepower Threat Defense (FTD) Software operating in transparent mode could allow an unauthenticated, remote attacker to poison MAC address tables, resulting in a denial of service (DoS) vulnerability. This vulnerability is due to incorrect handling of certain TCP segments when the affected device is operating in transparent mode. An attacker could exploit this vulnerability by sending a crafted TCP segment through an affected device. A successful exploit could allow the attacker to poison the MAC address tables in adjacent devices, resulting in network disruption.

CVE-2021-34793 has been assigned by [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: Cisco - Cisco Adaptive Security Appliance (ASA) Software version n/a

CVSS3 Score: 8.6 - HIGH

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

CVSS2 Score: 5 - MEDIUM

Access Vector^ⓘ	Access Complexity	Authentication
NETWORK	LOW	NONE
Confidentiality Impact	Integrity Impact	Availability Impact
NONE	NONE	PARTIAL

CVE References

Description	Tags ^ⓘ	Link
Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Transparent Mode Denial of Service Vulnerability	tools.cisco.com text/html	CISCO 20211027 Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software Transparent Mode Denial of Service Vulnerability

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Related QID Numbers

317090 Cisco Adaptive Security Appliance (ASA) Software Denial of Service (DoS) Vulnerability (cisco-sa-asa-ftd-dos-JxYWMJyL)
317097 Cisco Firepower Threat Defense (FTD) Software Transparent Mode Denial of Service (DoS) Vulnerability (cisco-sa-asa-ftd-dos-JxYWMJyL)

Known Affected Configurations (CPE V2.3)

Type	Vendor	Product	Version	Update	Edition	Language
Application	Cisco	Adaptive Security Appliance	All	All	All	All
Hardware	Cisco	Asa 5505	-	All	All	All
Operating System	Cisco	Asa 5505 Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5512-x	-	All	All	All
Operating System	Cisco	Asa 5512-x Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5515-x	-	All	All	All
Operating System	Cisco	Asa 5515-x Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5525-x	-	All	All	All
Operating System	Cisco	Asa 5525-x Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5545-x	-	All	All	All
Operating System	Cisco	Asa 5545-x Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5555-x	-	All	All	All
Operating System	Cisco	Asa 5555-x Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5580	-	All	All	All
Operating System	Cisco	Asa 5580 Firmware	009.008\(004.025\)	All	All	All
Hardware	Cisco	Asa 5585-x	-	All	All	All
Operating System	Cisco	Asa 5585-x Firmware	009.008\(004.025\)	All	All	All
Application	Cisco	Firepower Threat Defense	All	All	All	All

cpe:2.3:a:cisco:adaptive_security_appliance:*:*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5505:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5505_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5512-x:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5512-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5515-x:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5515-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5525-x:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5525-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5545-x:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5545-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5555-x:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5555-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5580:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5580_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:h:cisco:asa_5585-x:-:*:*:*:*:*:*:*:
cpe:2.3:o:cisco:asa_5585-x_firmware:009.008\(004.025\):*:*:*:*:*:*:*:
cpe:2.3:a:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*:

No vendor comments have been submitted for this CVE

Social Mentions

Source	Title	Posted (UTC)
@CVEreport	CVE-2021-34793 : A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance ASA Software and Fi… twitter.com/i/web/status/1…	2021-10-27 19:10:47
@softek_jp	Cisco ASA Software の TCP ノーマライザの処理にサービスを妨害される問題 (CVE-2021-34793) [40357] sid.softek.jp/content/show/4… #SIDfm #脆弱性情報	2021-10-28 05:30:49
@SecRiskRptSME	RT: CVE-2021-34793 A vulnerability in the TCP Normalizer of Cisco Adaptive Security Appliance (ASA) Software and F… twitter.com/i/web/status/1…	2021-10-28 07:33:49
@GrupoICA_Ciber	?CISCO? Múltiples vulnerabilidades de severidad alta en productos CISCO: CVE-2021-34783,CVE-2021-34793,CVE-2021-3… twitter.com/i/web/status/1…	2021-10-30 07:56:33