#VU56859 Always-Incorrect Control Flow Implementation in Cisco Systems, Inc products - CVE-2021-34767

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Main Vulnerability Database Vulnerabilities #VU56859

#VU56859 Always-Incorrect Control Flow Implementation in Cisco Systems, Inc products - CVE-2021-34767

Published: September 24, 2021


Vulnerability identifier: #VU56859
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-34767
CWE-ID: CWE-670
Exploitation vector: Adjecent network
Exploit availability: No public exploit available
Vulnerable software:
Cisco IOS XE
Cisco Catalyst 9800 Wireless Controller
Catalyst 9800 Wireless Controllers for Cloud
Software vendor:
Cisco Systems, Inc

Description

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

The vulnerability exists due to a logic error when processing specific link-local IPv6 traffic. A remote attacker on the local network can send a specially crafted IPv6 packet and cause a denial of service condition on the target system.


Remediation

Install update from vendor's website.

External links