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 54× in last 7d / 227× 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 654 total refreshes for this CVE.

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

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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