CVE-2018-0163

Name: CVE-2018-0163
Creator: NVD / NIST
Published: 2018-03-28T22:29:00.75+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.66%

Last modified Jun 17, 2026

CVE-2018-0163 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. A vulnerability in the 802.1x multiple-authentication (multi-auth) feature of Cisco IOS Software could allow an unauthenticated, adjacent attacker to bypass the authentication phase on an 802.1x multi-auth port. The vulnerability is due to a logic change error introduced into the code. EPSS estimates a 0.66% chance of exploitation in the next 30 days.

Description

A vulnerability in the 802.1x multiple-authentication (multi-auth) feature of Cisco IOS Software could allow an unauthenticated, adjacent attacker to bypass the authentication phase on an 802.1x multi-auth port. The vulnerability is due to a logic change error introduced into the code. An attacker could exploit this vulnerability by trying to access an 802.1x multi-auth port after a successful supplicant has authenticated. An exploit could allow the attacker to bypass the 802.1x access controls and obtain access to the network. Cisco Bug IDs: CSCvg69701.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

0.66%

46.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cisco	Ios	15.4\(3\)m6
Cisco	Ios	15.4\(3\)m6a
Cisco	Ios	15.4\(3\)m7
Cisco	Ios	15.4\(3\)m7a
Cisco	Ios	15.4\(3\)m8
Cisco	Ios	15.4\(3.0i\)m6
Cisco	Ios	15.5\(3\)m3
Cisco	Ios	15.5\(3\)m4
Cisco	Ios	15.5\(3\)m4a
Cisco	Ios	15.5\(3\)m4b
Cisco	Ios	15.5\(3\)m4c
Cisco	Ios	15.5\(3\)m5
Cisco	Ios	15.5\(3\)m5a
Cisco	Ios	15.5\(3\)m6
Cisco	Ios	15.5\(3\)m6a
Cisco	Ios	15.6\(1\)t2
Cisco	Ios	15.6\(1\)t3
Cisco	Ios	15.6\(2\)t1
Cisco	Ios	15.6\(2\)t2
Cisco	Ios	15.6\(2\)t3
Cisco	Ios	15.6\(3\)m
Cisco	Ios	15.6\(3\)m0a
Cisco	Ios	15.6\(3\)m1
Cisco	Ios	15.6\(3\)m1a
Cisco	Ios	15.6\(3\)m1b
Cisco	Ios	15.6\(3\)m2
Cisco	Ios	15.6\(3\)m2a
Cisco	Ios	15.6\(3\)m3
Cisco	Ios	15.6\(3\)m3a
Cisco	Ios	15.7\(3\)m
Cisco	Ios	15.7\(3\)m0a
Cisco	Ios	15.7\(3\)m1
Cisco	Ios	15.7\(3\)m2

References

http://www.securityfocus.com/bid/103571Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dot1xVendor Advisory
http://www.securityfocus.com/bid/103571Third Party Advisory, VDB Entry
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dot1xVendor Advisory

Timeline

Published: Mar 28, 2018
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-0163?

How severe is CVE-2018-0163?

CVE-2018-0163 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.66% probability of exploitation in the next 30 days.

How do I fix CVE-2018-0163?

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-2018-0163?

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

Scan your code now

Source: NVD / NIST