Heap-based buffer overflow in Cisco Systems, Inc products - CVE-2021-34770
Published: September 24, 2021
Vulnerability identifier: #VU56857
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34770
CWE-ID: CWE-122
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to a boundary error in the Control and Provisioning of Wireless Access Points (CAPWAP) protocol. A remote attacker can pass specially crafted data to the application, trigger heap-based buffer overflow and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
Catalyst 9800 Embedded Wireless Controller
Cisco Catalyst 9800 Series Wireless Controllers
Catalyst 9800-CL Wireless Controllers for Cloud
Embedded Wireless Controller on Catalyst Access Points
Cisco IOS XE
Cisco Catalyst 9800 Series Wireless Controllers
Catalyst 9800-CL Wireless Controllers for Cloud
Embedded Wireless Controller on Catalyst Access Points
Cisco IOS XE
How to mitigate CVE-2021-34770
Install updates from vendor's website.
Cisco IOS XE - addressed in versions 16.12(4.38), 16.12.5, 17.3(1.90), 17.3.2, 17.3.2a, 17.4(0.154), 17.4.1, 17.4.2, 17.5(0.56), 17.5.1