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PatchSiren cyber security CVE debrief

CVE-2018-0155 Cisco CVE debrief

CVE-2018-0155 is a Cisco Catalyst Bidirectional Forwarding Detection (BFD) denial-of-service vulnerability affecting Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches. In the supplied records, CISA lists the issue in its Known Exploited Vulnerabilities catalog, so it should be treated as a high-priority remediation item. The source corpus does not provide CVSS scoring or exploit mechanics, so this debrief stays limited to the official metadata and remediation guidance referenced there.

Vendor
Cisco
Product
Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2022-03-03
Original CVE updated
2022-03-03
Advisory published
2022-03-03
Advisory updated
2022-03-03

Who should care

Network and infrastructure teams responsible for Cisco Catalyst 4500 and 4500-X switches, especially administrators handling routing, edge, or high-availability network functions. Security teams tracking CISA KEV exposure should also prioritize this item.

Technical summary

The vulnerability is described as a denial-of-service issue in Cisco Catalyst Bidirectional Forwarding Detection handling on affected Cisco Catalyst 4500 Series and 4500-X Series switches. The supplied official metadata does not include the detailed trigger conditions or impact depth, but it does identify the issue as known exploited and associated with Cisco switch products.

Defensive priority

High. CISA KEV inclusion means this issue is already recognized as exploited in the wild and should be remediated urgently according to vendor instructions.

Recommended defensive actions

  • Apply Cisco updates per vendor instructions as referenced by CISA.
  • Inventory Cisco Catalyst 4500 Series and 4500-X Series switches to confirm exposure.
  • Treat any exposed or business-critical switch running affected software as urgent remediation priority.
  • Track remediation against the supplied KEV due date of 2022-03-17 for compliance purposes.
  • Verify patching and monitor for service instability on affected network devices after remediation.

Evidence notes

This debrief is based only on the supplied official metadata: the CVE title/description, the CISA KEV entry, and the linked official record references. The source corpus states the vulnerability is a Cisco Catalyst BFD denial-of-service issue and that CISA added it to KEV on 2022-03-03 with a due date of 2022-03-17. No CVSS score, exploit chain details, or additional technical behavior are provided in the supplied materials.

Official resources

Public defensive summary derived from official CVE/CISA metadata in the supplied corpus. No exploit code or operational abuse guidance included.