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
Published Mar 28, 2018
6.5
MEDIUMCVSS 3.1
EPSS 0.63%
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.
Affected products
- Vendor n/a Product Cisco IOS Defaultn/a
- Version Cisco IOSStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| n/a | Cisco IOS | n/a |
|
- 15.4\(3\)m6
- 15.4\(3\)m6a
- 15.4\(3\)m7
- 15.4\(3\)m7a
- 15.4\(3\)m8
- 15.4\(3.0i\)m6
- 15.5\(3\)m3
- 15.5\(3\)m4
- 15.5\(3\)m4a
- 15.5\(3\)m4b
- 15.5\(3\)m4c
- 15.5\(3\)m5
- 15.5\(3\)m5a
- 15.5\(3\)m6
- 15.5\(3\)m6a
- 15.6\(1\)t2
- 15.6\(1\)t3
- 15.6\(2\)t1
- 15.6\(2\)t2
- 15.6\(2\)t3
- 15.6\(3\)m
- 15.6\(3\)m0a
- 15.6\(3\)m1
- 15.6\(3\)m1a
- 15.6\(3\)m1b
- 15.6\(3\)m2
- 15.6\(3\)m2a
- 15.6\(3\)m3
- 15.6\(3\)m3a
- 15.7\(3\)m
- 15.7\(3\)m0a
- 15.7\(3\)m1
- 15.7\(3\)m2
Running on/with
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No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
No CVSS v3.0 score for this CVE.
AV:A/AC:L/Au:N/C:N/I:P/A:N
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Dec 2, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.63% (0.00632) | 48.41th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.63% (0.00632) | 48.90th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.05% (0.00052) | 20.91th | v3 (v2023.03.01) |
| May 16, 2024 | 0.05% (0.00052) | 19.70th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.05% (0.00051) | 17.69th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.62% (0.00624) | 17.80th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.62% (0.00624) | 0.00th | v1 |
References (2)
- http://www.securityfocus.com/bid/103571 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dot1x x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/103571 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dot1x | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.