CVE-2018-0155VulnerabilityPublished 03/03/2022Updated 10/24/2026
CVE-2018-0155: Cisco Catalyst Bidirectional Forwarding Detection Denial-of-Service Vulnerability
Affects Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series SwitchesSource CISA KEV
Severity
HighNo CVSS score published yet
- Exploitation
Actively exploited – in CISA KEV since 03/03/2022
- KEV deadline
- 03/17/2022
- EPSS
- 7.7% chance of exploitation in 30 days – higher than 94% of CVEs
What to do
CISA required action
Apply updates per vendor instructions.
Description
CVE-2018-0155 is a denial-of-service vulnerability in the Bidirectional Forwarding Detection (BFD) offload implementation of Cisco Catalyst 4500 Series and 4500-X Series Switches. An unauthenticated remote attacker can exploit this flaw to crash the iosd process, causing a DoS condition. This vulnerability has been exploited in the wild.