CVEs / CVE-2018-0167

CVE-2018-0167: Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability

Known exploited in the CISA KEV catalog since 3 Mar 2022
high 8.8 CVSS 3.1 (NVD)
EPSS 3.35% chance of exploitation in the next 30 days, higher than 88% of CVEs (30 Oct 2026)
Last changed at its sources 17 Jun 2026

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Summary

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.
CISA, Known Exploited Vulnerabilities catalog

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.
The CVE record, via NVD · published 28 Mar 2018 · NVD status: Analyzed

Affected and fixed versions

As stated by the CVE record (from the CNA)
Product	Affected	Fixed in
n/a Cisco IOS, IOS XE, and IOS XR	Cisco IOS, IOS XE, and IOS XR	—

Exploitation

In CISA KEV since	3 Mar 2022
Due date for US federal agencies	17 Mar 2022
Used in ransomware campaigns	Unknown
Required action	Apply updates per vendor instructions.

Severity

CVSS 3.1	8.8 high `CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Scored by NVD
Weakness	CWE-119

References

CVE-2018-0167 on NVD
CVE-2018-0167 in the CISA KEV catalog
http://www.securityfocus.com/bid/103564 Broken Link, Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1040586 Broken Link, Third Party Advisory, VDB Entry
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-03 Third Party Advisory, US Government Resource
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-04 Third Party Advisory, US Government Resource
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05 Third Party Advisory, US Government Resource
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-lldp Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0167 US Government Resource

Sources

Exploitation status from the CISA Known Exploited Vulnerabilities catalog. EPSS scores from FIRST. Descriptions, severity and references from the National Vulnerability Database. Open-source package versions from OSV (CC-BY 4.0). Text is shown as each source states it; Stackurity does not edit it. Check the vendor's advisory before acting.

This product uses data from the NVD API but is not endorsed or certified by the NVD.