CVE-2018-0155

HIGHNVD 8.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-03-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.6 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 4 sources updated this weekExploited in the wild
8.6
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 8%CVSS: 8.6Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
8.6
EG Score
9.0(high)
EPSS
94.0%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 13, 2026

Advisory Details (4)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-0155
generic🔴 Active Exploitation

Cisco IOS and IOS XE Software Bidirectional Forwarding Detection Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-bfd
generic
http://www.securitytracker.com/id/1040587
generic
http://www.securityfocus.com/bid/103565

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 90× in last 7d / 380× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 542 total refreshes for this CVE.

  1. 2026-07-11 21:21 UTCEG score recompute
  2. 2026-07-11 21:21 UTCGHSA enrichment
  3. 2026-07-11 17:00 UTCEG score recompute
  4. 2026-07-11 17:00 UTCGHSA enrichment
  5. 2026-07-11 12:39 UTCEG score recompute
  6. 2026-07-11 12:39 UTCGHSA enrichment
  7. 2026-07-11 08:24 UTCEPSS rescore
  8. 2026-07-11 08:18 UTCEG score recompute
  9. 2026-07-11 08:18 UTCGHSA enrichment
  10. 2026-07-11 03:57 UTCEG score recompute
  11. 2026-07-11 03:57 UTCGHSA enrichment
  12. 2026-07-10 23:36 UTCEG score recompute
  13. 2026-07-10 23:36 UTCGHSA enrichment
  14. 2026-07-10 19:14 UTCEG score recompute
  15. 2026-07-10 19:14 UTCGHSA enrichment
  16. 2026-07-10 17:52 UTCCISA KEV update
  17. 2026-07-10 14:53 UTCEG score recompute
  18. 2026-07-10 14:53 UTCGHSA enrichment
  19. 2026-07-10 10:31 UTCEG score recompute
  20. 2026-07-10 10:31 UTCGHSA enrichment
  21. 2026-07-10 06:10 UTCEG score recompute
  22. 2026-07-10 06:10 UTCGHSA enrichment
  23. 2026-07-10 01:48 UTCEG score recompute
  24. 2026-07-10 01:48 UTCGHSA enrichment
  25. 2026-07-09 21:28 UTCEG score recompute
Show 75 more
  1. 2026-07-09 21:27 UTCGHSA enrichment
  2. 2026-07-09 19:06 UTCEPSS rescore
  3. 2026-07-09 17:06 UTCEG score recompute
  4. 2026-07-09 17:06 UTCGHSA enrichment
  5. 2026-07-09 12:45 UTCEG score recompute
  6. 2026-07-09 12:45 UTCGHSA enrichment
  7. 2026-07-09 08:24 UTCEG score recompute
  8. 2026-07-09 08:24 UTCGHSA enrichment
  9. 2026-07-09 04:03 UTCEG score recompute
  10. 2026-07-09 04:02 UTCGHSA enrichment
  11. 2026-07-08 23:41 UTCEG score recompute
  12. 2026-07-08 23:41 UTCGHSA enrichment
  13. 2026-07-08 19:19 UTCEG score recompute
  14. 2026-07-08 19:18 UTCGHSA enrichment
  15. 2026-07-08 15:11 UTCEPSS rescore
  16. 2026-07-08 14:56 UTCEG score recompute
  17. 2026-07-08 14:56 UTCGHSA enrichment
  18. 2026-07-08 10:35 UTCEG score recompute
  19. 2026-07-08 10:35 UTCGHSA enrichment
  20. 2026-07-08 06:13 UTCEG score recompute
  21. 2026-07-08 06:13 UTCGHSA enrichment
  22. 2026-07-08 01:50 UTCEG score recompute
  23. 2026-07-08 01:50 UTCGHSA enrichment
  24. 2026-07-07 21:29 UTCEG score recompute
  25. 2026-07-07 21:29 UTCGHSA enrichment
  26. 2026-07-07 19:01 UTCCISA KEV update
  27. 2026-07-07 17:16 UTCCISA KEV update
  28. 2026-07-07 17:08 UTCEG score recompute
  29. 2026-07-07 17:07 UTCGHSA enrichment
  30. 2026-07-07 13:42 UTCEPSS rescore
  31. 2026-07-07 12:44 UTCEG score recompute
  32. 2026-07-07 12:44 UTCGHSA enrichment
  33. 2026-07-07 08:22 UTCEG score recompute
  34. 2026-07-07 08:22 UTCGHSA enrichment
  35. 2026-07-07 04:00 UTCEG score recompute
  36. 2026-07-07 04:00 UTCGHSA enrichment
  37. 2026-07-06 23:38 UTCEG score recompute
  38. 2026-07-06 23:38 UTCGHSA enrichment
  39. 2026-07-06 19:16 UTCEG score recompute
  40. 2026-07-06 19:16 UTCGHSA enrichment
  41. 2026-07-06 16:24 UTCEPSS rescore
  42. 2026-07-06 16:24 UTCEPSS rescore
  43. 2026-07-06 14:55 UTCEG score recompute
  44. 2026-07-06 14:54 UTCGHSA enrichment
  45. 2026-07-06 10:31 UTCEG score recompute
  46. 2026-07-06 10:31 UTCGHSA enrichment
  47. 2026-07-06 06:10 UTCEG score recompute
  48. 2026-07-06 06:10 UTCGHSA enrichment
  49. 2026-07-06 02:20 UTCEPSS rescore
  50. 2026-07-06 02:20 UTCEPSS rescore
  51. 2026-07-06 01:45 UTCEG score recompute
  52. 2026-07-06 01:45 UTCGHSA enrichment
  53. 2026-07-05 21:24 UTCEG score recompute
  54. 2026-07-05 21:24 UTCGHSA enrichment
  55. 2026-07-05 17:02 UTCEG score recompute
  56. 2026-07-05 17:02 UTCGHSA enrichment
  57. 2026-07-05 12:41 UTCEG score recompute
  58. 2026-07-05 12:40 UTCGHSA enrichment
  59. 2026-07-05 08:19 UTCEG score recompute
  60. 2026-07-05 08:19 UTCGHSA enrichment
  61. 2026-07-05 03:58 UTCEG score recompute
  62. 2026-07-05 03:58 UTCGHSA enrichment
  63. 2026-07-05 02:27 UTCEPSS rescore
  64. 2026-07-04 23:35 UTCEG score recompute
  65. 2026-07-04 23:35 UTCGHSA enrichment
  66. 2026-07-04 19:14 UTCEG score recompute
  67. 2026-07-04 19:14 UTCGHSA enrichment
  68. 2026-07-04 14:52 UTCEG score recompute
  69. 2026-07-04 14:52 UTCGHSA enrichment
  70. 2026-07-04 10:31 UTCEG score recompute
  71. 2026-07-04 10:31 UTCGHSA enrichment
  72. 2026-07-04 06:28 UTCEPSS rescore
  73. 2026-07-04 06:28 UTCEPSS rescore
  74. 2026-07-04 06:10 UTCEG score recompute
  75. 2026-07-04 06:10 UTCGHSA enrichment

Frequently asked(6)

What is CVE-2018-0155?
CVE-2018-0155 is a high vulnerability published on March 28, 2018. 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.…
When was CVE-2018-0155 disclosed?
CVE-2018-0155 was first published in the National Vulnerability Database on March 28, 2018, with the most recent update on January 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0155 actively exploited?
Yes. CISA added CVE-2018-0155 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-0155?
CVE-2018-0155 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2018-0155?
CVE-2018-0155 affects Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches. The full affected-products list, including version ranges and fixed versions, is shown in the Affected Packages section of this page.
How do I remediate CVE-2018-0155?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0155, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2018-0155

Explore →

Is Your Infrastructure Affected by CVE-2018-0155?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs