SB2021102803 - Denial of service in Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software

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Main Vulnerability Database SB2021102803

SB2021102803 - Denial of service in Cisco Adaptive Security Appliance Software and Firepower Threat Defense Software

Published: October 28, 2021

Security Bulletin ID SB2021102803
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper Enforcement of Message Integrity During Transmission in a Communication Channel (CVE-ID: CVE-2021-34793)

CWE-ID: CWE-924 - Improper Enforcement of Message Integrity During Transmission in a Communication Channel

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists in the TCP Normalizer when handling certain TCP segments. A remote attacker can send a specially crafted TCP segment through an affected device and poison MAC address tables.

Successful exploitation of the vulnerability may allow an attacker to perform a denial of service attack but requires the affected device to be operating in transparent mode.


Remediation

Install update from vendor's website.

References