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VULNERABILITIES

CVE-2021-34793 Details

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

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL CVEVendor Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asa-ftd-dos-JxYWMJyL [email protected]Vendor Advisory

Weakness Enumeration

CWE-IDCWE NameSource
CWE-924Improper Enforcement of Message Integrity During Transmission in a Communication Channel[email protected]
CWE-924Improper Enforcement of Message Integrity During Transmission in a Communication Channel[email protected]

Affected Products

ProductVersions

Change History

14 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2021-34793
NVD Published Date:
Oct 27, 2021
NVD Last Modified:
Aug 11, 2026
Source:
[email protected]
CVE-2021-34793 Details - Not Deferred