CVE-2017-12213

Name: CVE-2017-12213
Creator: NVD / NIST
Published: 2017-09-07T21:29:00.317+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 0.78%

Last modified Jun 17, 2026

CVE-2017-12213 is a vulnerability of currently unknown severity. 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. EPSS estimates a 0.78% chance of exploitation in the next 30 days.

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.

Metrics

EPSS Probability

0.78%

51.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Ios Xe	All versions

References

http://www.securityfocus.com/bid/100663Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039284Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-catMitigation, Vendor Advisory
http://www.securityfocus.com/bid/100663Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1039284Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170906-catMitigation, Vendor Advisory

Timeline

Published: Sep 7, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-12213?

How severe is CVE-2017-12213?

Severity scoring for CVE-2017-12213 is pending analysis. The EPSS model estimates a 0.78% probability of exploitation in the next 30 days.

How do I fix CVE-2017-12213?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-12213?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST