NVD / CVE Program· CNA cisco

CVE-2018-0163: A vulnerability in the 802.1x multiple-authentication (multi-auth) feature of Cisco IOS Software could allow an unauthenticated, adjacent…

MediumCVSS 6.5 · v3.1—No exploit No fix recorded

Noroxi assessment

Priority: Monitor (action score 26/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.63% (FIRST EPSS); higher than 50.8% of all records.
Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to the record, no fixed version is available yet.

Low priority for now. Update when a fix is released; follow the vendor's advisory.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

Published: Mar 28, 2018
Updated: Jun 16, 2026
EPSS: 0.6% · 50th percentile
CWE: CWE-287

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 26 / 40 · 6.5 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.6%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
No fixed version yet

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
cisco	ios	cpe:2.3:o:cisco:ios
cisco	1120 connected grid router	cpe:2.3:h:cisco:1120_connected_grid_router
cisco	1240 connected grid router	cpe:2.3:h:cisco:1240_connected_grid_router
cisco	1905 serial integrated services router	cpe:2.3:h:cisco:1905_serial_integrated_services_router
cisco	1906c integrated services router	cpe:2.3:h:cisco:1906c_integrated_services_router
cisco	1921 integrated services router	cpe:2.3:h:cisco:1921_integrated_services_router
cisco	1941 integrated services router	cpe:2.3:h:cisco:1941_integrated_services_router
cisco	1941w integrated services router	cpe:2.3:h:cisco:1941w_integrated_services_router
cisco	2010 connected grid router	cpe:2.3:h:cisco:2010_connected_grid_router
cisco	2901 integrated services router	cpe:2.3:h:cisco:2901_integrated_services_router
cisco	2911 integrated services router	cpe:2.3:h:cisco:2911_integrated_services_router
cisco	2911a integrated services router	cpe:2.3:h:cisco:2911a_integrated_services_router

and 84 more

Versions reported by the vendor

Affected version ranges reported by the assigning authority (cisco). Independent of NVD's CPE analysis and usually ahead of it.

n/a Cisco IOS
- Cisco IOSaffected

Affected versions · NVD (20)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

cisco ios15.4(3.0i)m6
cisco ios15.4(3)m6
cisco ios15.4(3)m6a
cisco ios15.4(3)m7
cisco ios15.4(3)m7a
cisco ios15.4(3)m8
cisco ios15.5(3)m3
cisco ios15.5(3)m4
cisco ios15.5(3)m4a
cisco ios15.5(3)m4b
cisco ios15.5(3)m4c
cisco ios15.5(3)m5
cisco ios15.5(3)m5a
cisco ios15.5(3)m6
cisco ios15.5(3)m6a
cisco ios15.6(1)t2
cisco ios15.6(1)t3
cisco ios15.6(2)t1
cisco ios15.6(2)t2
cisco ios15.6(2)t3

Same product

cisco: all records

Other highest-scoring records for the same primary product.

CVE-2018-0171A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote…KEV
99Now
CVE-2017-3881A vulnerability in the Cisco Cluster Management Protocol (CMP) processing code in Cisco IOS and Cisco IOS XE Software could allow an…KEV
99Now
CVE-2017-6736The Simple Network Management Protocol (SNMP) subsystem of Cisco IOS and IOS XE Software contains multiple vulnerabilities that could allow…KEV
86Now

Published before and after this one in the same product

← EarlierCVE-2018-0159Mar 28, 2018 · A vulnerability in the implementation of Internet Key Exchange Version 1 (IKEv1) functionality in Cisco IOS Software and Cisco IOS XE…KEV
62This week
← EarlierCVE-2018-0161Mar 28, 2018 · A vulnerability in the Simple Network Management Protocol (SNMP) subsystem of Cisco IOS Software running on certain models of Cisco…KEV
56Plan
Later →CVE-2018-0167Mar 28, 2018 · Multiple Buffer Overflow vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE…KEV
66This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

No fix version is recorded for this entry. Check the references for vendor advisories.

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Someone on the same network segment can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Adjacent
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-primary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log (0)

No changes recorded on tracked fields yet. Score, KEV, exploit maturity and fix status changes appear here.

References

www.securityfocus.com/bid/103571

Show all references (1 more)

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-dot1x

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records