NULL pointer dereference in Cisco Systems, Inc products - CVE-2021-34768
Published: September 24, 2021
Vulnerability identifier: #VU56854
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2021-34768
CWE-ID: CWE-476
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.
Affected software
Catalyst 9800 Embedded Wireless Controller
Cisco Catalyst 9800 Series Wireless Controllers
Catalyst 9800-CL Wireless Controllers for Cloud
Cisco Embedded Wireless Controller Software for Catalyst Access Points
Cisco IOS XE
Cisco Catalyst 9800 Series Wireless Controllers
Catalyst 9800-CL Wireless Controllers for Cloud
Cisco Embedded Wireless Controller Software for Catalyst Access Points
Cisco IOS XE
How to mitigate CVE-2021-34768
Install updates from vendor's website.
Cisco IOS XE - addressed in versions 16.12.5, 16.12.6, 17.3.2a, 17.3.3, 17.3.4, 17.4.1, 17.5.1, 17.6.1