CVE-2022-20856 Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family CAPWAP Mobility Denial of Service Vulnerability
Unauthenticated remote attackers can cause a denial of service on Cisco Catalyst 9000 wireless controllers by sending crafted CAPWAP Mobility packets.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2022-20856?
CVE-2022-20856 is a high-severity denial of service vulnerability in Cisco Ios Xe, published on 30 Sep 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the processing of Control and Provisioning of Wireless Access Points (CAPWAP) Mobility messages in Cisco IOS XE Wireless Controller Software for the Catalyst 9000 Family could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to a logic error and improper management of resources related to the handling of CAPWAP Mobility messages. An attacker could exploit this vulnerability by sending crafted CAPWAP Mobility packets to an affected device. A successful exploit could allow the attacker to exhaust resources on the affected device. This would cause the device to reload, resulting in a DoS condition.
Weakness: CWE-664
Which versions are affected by CVE-2022-20856?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2022-20856?
No fix has been published for CVE-2022-20856 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2022-20856 being exploited?
There is no known exploitation of CVE-2022-20856 in the wild and no public exploit code.
Other vulnerabilities in Cisco Ios Xe
- CVE-2023-20198 Cisco IOS XE Web UI Privilege Escalation
- CVE-2018-0151 Cisco IOS Software and Cisco IOS XE Software Quality of Service Remote Code Execution
- CVE-2023-20273 Cisco IOS XE Web UI Command Injection
- CVE-2025-20188 Hardcoded credentials in Cisco IOS XE Software
- CVE-2021-34770 Cisco IOS XE Software for Catalyst 9000 Family Wireless Controllers CAPWAP Remote Code Execution Vulnerability
Sources
Also known as GHSA-q52w-4rvg-f65r.