# CVE-2018-0155

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.

- Page: https://www.vulneraibility.com/cve/CVE-2018-0155
- CVSS: 8.6
- Known exploited: yes, in CISA KEV since 2022-03-03; CISA due date 2022-03-17
- EPSS: 7.74% (percentile 94.7)
- CISA SSVC: exploitation active, automatable yes, technical impact partial (assessed 2024-11-08)
- Weakness: CWE-388
- Published: 2018-03-28

## Affected versions

- Cisco IOS and IOS XE: affected Cisco IOS and IOS XE

A version outside these ranges is not a statement that it is unaffected.

## References

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

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Summary, impact and action are written by the vulneraibility.com AI analysis pipeline from the CVE record, NVD, CISA and FIRST data; verify against the references.