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CVE-2021-34793 Detail

Modified

This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.

Description

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.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

CNA: Cisco Systems, Inc.

Base Score: 8.6 HIGH

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: 5.0 MEDIUM

Vector: (AV:N/AC:L/Au:N/C:N/I:N/A:P)

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL	Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-924	Improper Enforcement of Message Integrity During Transmission in a Communication Channel	NIST Cisco Systems, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Denotes Vulnerable Software
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Change History

8 change records found show changes

Initial Analysis by NIST 10/28/2021 10:12:47 PM

Action	Type	Old Value	New Value
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5505_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5505:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5512-x_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5512-x:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5515-x_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5515-x:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5525-x_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5525-x:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5545-x_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5545-x:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5555-x_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5555-x:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5580_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5580:-:::::::*
Added	CPE Configuration		AND OR cpe:2.3:o:cisco:asa_5585-x_firmware:009.008\(004.025\)::::::: OR cpe:2.3:h:cisco:asa_5585-x:-:::::::*
Added	CPE Configuration		Record truncated, showing 500 of 948 characters. View Entire Change Record OR cpe:2.3:a:cisco:adaptive_security_appliance::::::::* versions up to (excluding) 9.8.4.40 cpe:2.3:a:cisco:adaptive_security_appliance::::::::* versions from (including) 9.9.0 up to (excluding) 9.12.4.29 cpe:2.3:a:cisco:adaptive_security_appliance::::::::* versions from (including) 9.13.0 up to (excluding) 9.14.3.9 cpe:2.3:a:cisco:adaptive_security_appliance::::::::* versions from (including) 9.15.0 up to (excluding) 9.15.1.17 *cpe:2.3:a:
Added	CVSS V2		NIST (AV:N/AC:L/Au:N/C:N/I:N/A:P)
Added	CVSS V3.1		NIST AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Added	CWE		NIST CWE-924
Changed	Reference Type	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL No Types Assigned	https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL Vendor Advisory

Quick Info

CVE Dictionary Entry:
CVE-2021-34793
NVD Published Date:
10/27/2021
NVD Last Modified:
11/06/2023
Source:
Cisco Systems, Inc.

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Information Technology Laboratory

National Vulnerability Database

National Vulnerability Database

CVE-2021-34793 Detail

Description

Metrics

References to Advisories, Solutions, and Tools

Weakness Enumeration

Known Affected Software Configurations Switch to CPE 2.2

CPEs loading, please wait.

Change History

CVE Modified by Cisco Systems, Inc. 5/14/2024 5:15:27 AM

CVE Modified by Cisco Systems, Inc. 11/06/2023 10:36:26 PM

CPE Deprecation Remap by NIST 8/16/2023 12:17:07 PM

CPE Deprecation Remap by NIST 8/16/2023 12:17:07 PM

CPE Deprecation Remap by NIST 8/16/2023 12:17:07 PM

CPE Deprecation Remap by NIST 8/16/2023 12:17:07 PM

Initial Analysis by NIST 10/28/2021 10:12:47 PM

CVE Modified by Cisco Systems, Inc. 10/27/2021 4:15:12 PM

Quick Info