SB2021092411 - Denial of service in Cisco IOS XE Software for Catalyst 9800 Series Wireless Controllers
Published: September 24, 2021
Security Bulletin ID
SB2021092411
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 security vulnerability.
1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2021-34767)
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.