CVE-2017-12213 Auth bypass in Cisco Catalyst 4000 Series Switches
An adjacent attacker can bypass 802.1x authentication on Cisco Catalyst switches, causing ports to fail open and allowing unauthorized traffic access.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-12213?
CVE-2017-12213 is a medium-severity authentication bypass vulnerability in Cisco Ios Xe, published on 7 Sep 2017. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A vulnerability in the dynamic access control list (ACL) feature of Cisco IOS XE Software running on Cisco Catalyst 4000 Series Switches could allow an unauthenticated, adjacent attacker to cause dynamic ACL assignment to fail and the port to fail open. This could allow the attacker to pass traffic to the default VLAN of the affected port. The vulnerability is due to an uncaught error condition that may occur during the reassignment of the auth-default-ACL dynamic ACL to a switch port after 802.1x authentication fails. A successful exploit of this issue could allow a physically adjacent attacker to bypass 802.1x authentication and cause the affected port to fail open, allowing the attacker to pass traffic to the default VLAN of the affected switch port. Cisco Bug IDs: CSCvc72751.
Weakness: CWE-287
Which versions are affected by CVE-2017-12213?
It affects 1 product.
Products include Cisco Ios Xe.
How do I fix CVE-2017-12213?
No fix has been published for CVE-2017-12213 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2017-12213 being exploited?
There is no known exploitation of CVE-2017-12213 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-q9g3-ff96-6rfj.