SB2021092411 - Denial of service in Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers
Published: September 24, 2021
Security Bulletin ID
SB2021092411
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Adjecent network
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2021-34767)
CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation
CVSSv4: 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
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.