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

High severity, CVSS 8.8. Actively exploited: in CISA KEV since 2022-03-03. EPSS: 3.4% chance of exploitation in the next 30 days.

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.

Affected products

• Cisco IOS: version 5.2.0.base only; up to and including 15.6.3m1; up to and including 15.2\(6\)e0a; up to and including 15.2\(4a\)ea5
• Cisco IOS XE: version 5.2.0.base only; up to and including 15.6.3m1; up to and including 15.2\(6\)e0a; up to and including 15.2\(4a\)ea5
• Cisco IOS XR: from 4.1, before 5.1.3 (fixed in 5.1.3)

Published 2018-03-28. Last modified 2026-06-17.