Reference page — cumulative record through Thursday, October 8, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2018-0155

CVE-2018-0155HIGH

n/a Cisco IOS and IOS XE — Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   N   L   N   N  C  N  N  H    8.6   .0774   94.5   YES

AFFECTED
  Product               Versions                Fixed
  Cisco IOS and IOS XE  Cisco IOS and IOS XE –  —

TIMELINE
  Nov 27  Reserved by cisco
  Mar 28  Published (CNA: cisco)
  Mar 3   Added to CISA KEV, remediation due 2022-03-17

CWE-388 · CNA: cisco · CVSS v3.1 · 5 references · KEV due March 17, 2022

Description

A vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches could allow an unauthenticated, remote attacker to cause a crash of the iosd process, causing a denial of service (DoS) condition. The vulnerability is due to insufficient error handling when the BFD header in a BFD packet is incomplete. An attacker could exploit this vulnerability by sending a crafted BFD message to or across an affected switch. A successful exploit could allow the attacker to trigger a reload of the system. This vulnerability affects Catalyst 4500 Supervisor Engine 6-E (K5), Catalyst 4500 Supervisor Engine 6L-E (K10), Catalyst 4500 Supervisor Engine 7-E (K10), Catalyst 4500 Supervisor Engine 7L-E (K10), Catalyst 4500E Supervisor Engine 8-E (K10), Catalyst 4500E Supervisor Engine 8L-E (K10), Catalyst 4500E Supervisor Engine 9-E (K10), Catalyst 4500-X Series Switches (K10), Catalyst 4900M Switch (K5), Catalyst 4948E Ethernet Switch (K5). Cisco Bug IDs: CSCvc40729.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
November 27, 2017	Reserved	Reserved by cisco
March 28, 2018	Published	Published (CNA: cisco)
March 3, 2022	KEV ADDED	Added to CISA KEV, remediation due 2022-03-17

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	Cisco IOS and IOS XE	—	Cisco IOS and IOS XE	—

Weaknesses

CWE-388

References (5)

http://www.securityfocus.com/bid/103565 [vdb-entry, x_refsource_BID]
http://www.securitytracker.com/id/1040587 [vdb-entry, x_refsource_SECTRACK]
https://ics-cert.us-cert.gov/advisories/ICSA-18-107-05 [x_refsource_MISC]
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd [x_refsource_CONFIRM]
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0155 [government-resource]

Authoritative record: CVE-2018-0155 at cve.org

Weaknesses: CWE-388

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2018-0155 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Thursday, October 8, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.