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CVE-2018-0167

Cisco IOS, XR, and XE Software Buffer Overflow

8.8 HIGHActively exploited (CISA KEV)EPSS 3.35%
  1. Published28 Mar 2018
  2. Added to CISA KEV3 Mar 2022
  3. Remediation due17 Mar 2022
Actively exploited (CISA KEV)

There is a buffer overflow vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software which could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code.

Added to KEV: 3 Mar 2022Federal remediation due: 17 Mar 2022

Description

Multiple Buffer Overflow vulnerabilities in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code with elevated privileges on an affected device. Cisco Bug IDs: CSCuo17183, CSCvd73487.

CVSS 3.1 breakdown

Attack vectorAdjacent
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Cisco iOS≤ 15.2\(4a\)ea5 · ≤ 15.2\(6\)e0a · ≤ 15.6.3m1 · 5.2.0.base
Cisco iOS XE≤ 15.2\(4a\)ea5 · ≤ 15.2\(6\)e0a · ≤ 15.6.3m1 · 5.2.0.base
Cisco iOS XR≥ 4.1 < 5.1.3

Remediation

Fixed in
Cisco iOS XR≥ 5.1.3

References

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Frequently asked

Is CVE-2018-0167 being actively exploited?

Yes. CVE-2018-0167 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 3 Mar 2022.

How severe is CVE-2018-0167?

CVE-2018-0167 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 3.35% probability of exploitation.

Which products are affected by CVE-2018-0167?

Affected products include Cisco iOS, Cisco iOS XE, Cisco iOS XR.

How do I fix CVE-2018-0167?

Upgrade affected software to a fixed version, for example Cisco iOS XR 5.1.3 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2018-0167 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, Secuno flags any affected asset as top-priority automatically. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.