CVE-2018-0155

CRITICALNVD 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
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 8%CVSS: 8.6Exploit: cisa kev · ssvc activeExposed: 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)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
8%
EPSS %ILE
94%
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 40× in last 7d / 214× 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 429 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-0155?
CVE-2018-0155 is a critical 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.

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