CVE-2023-20100 Cisco IOS XE Software for Wireless LAN Controllers CAPWAP Join Denial of Service Vulnerability
An unauthenticated remote attacker can cause a denial of service on Cisco IOS XE Wireless LAN Controllers by manipulating the CAPWAP AP joining process.
- 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-2023-20100?
CVE-2023-20100 is a medium-severity denial of service vulnerability in Cisco Ios Xe, published on 23 Mar 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the access point (AP) joining process of the Control and Provisioning of Wireless Access Points (CAPWAP) protocol of Cisco IOS XE Software for Wireless LAN Controllers (WLCs) 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 that occurs when certain conditions are met during the AP joining process. An attacker could exploit this vulnerability by adding an AP that is under their control to the network. The attacker then must ensure that the AP successfully joins an affected wireless controller under certain conditions. Additionally, the attacker would need the ability to restart a valid AP that was previously connected to the controller. A successful exploit could allow the attacker to cause the affected device to restart unexpectedly, resulting in a DoS condition.
Weakness: CWE-694
Which versions are affected by CVE-2023-20100?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2023-20100?
No fix has been published for CVE-2023-20100 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-2023-20100 being exploited?
There is no known exploitation of CVE-2023-20100 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-hgvf-mqv4-fv8v.