How severe is CVE-2018-0163?

CVE-2018-0163 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2018-0163 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-0163?

CVE-2018-0163 primarily affects Cisco Ios. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2018-0163?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-0163 published?

CVE-2018-0163 was published on 2018-03-28 and last updated on 2026-06-17.

CVE-2018-0163

CVE-2018-0163 is a medium-severity vulnerability in Cisco Ios with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-287.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 3.3
EPSS exploit prediction: 1% (47th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-287
Affected product: Cisco Ios
Published: 2018-03-28
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2018-0163?: 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.
How severe is CVE-2018-0163?: CVE-2018-0163 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2018-0163 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (47th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-0163?: CVE-2018-0163 primarily affects Cisco Ios. In total, 33 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2018-0163?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-0163 published?: CVE-2018-0163 was published on 2018-03-28 and last updated on 2026-06-17.

References

Affected products (33)

cpe:2.3:o:cisco:ios:15.4\(3\)m6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)m6a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)m7:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)m7a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3\)m8:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.4\(3.0i\)m6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m4:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m4a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m4b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m4c:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m5:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m5a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m6:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.5\(3\)m6a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(1\)t2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(1\)t3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(2\)t1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(2\)t2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(2\)t3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m0a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m1a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m1b:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m2:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m2a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m3:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.6\(3\)m3a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.7\(3\)m:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.7\(3\)m0a:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.7\(3\)m1:*:*:*:*:*:*:*
cpe:2.3:o:cisco:ios:15.7\(3\)m2:*:*:*:*:*:*:*

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