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 — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 7.7%CVSS: 8.6Exploit: cisa kev · ssvc activeExposed services: Not assessed

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

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
9.0CRITICALhigh confidence
EG Risk
96
EG Risk 96/100CISA SSVC

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%
CISA SSVC: Attend at low or medium mission impact; Act at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low or medium mission impact and as soon as possible at high, and watch the vendor's advisory for the fix.
EPSS PROB
7.7%
EPSS %ILE
94th
KEV
⚠ Exploited

CISA SSVCAttend at low or medium mission impact; Act at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low or medium mission impact and as soon as possible at high, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

March 28, 2018

Last Modified

January 13, 2026

Advisory Details (4)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 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 / 230× 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 999 total refreshes for this CVE.

  1. 2026-10-10 01:53 UTCGHSA enrichment
  2. 2026-10-09 21:31 UTCEG score recompute
  3. 2026-10-09 21:31 UTCGHSA enrichment
  4. 2026-10-09 20:02 UTCEPSS rescore
  5. 2026-10-09 17:10 UTCGHSA enrichment
  6. 2026-10-09 12:47 UTCGHSA enrichment
  7. 2026-10-09 08:26 UTCGHSA enrichment
  8. 2026-10-09 04:05 UTCGHSA enrichment
  9. 2026-10-08 23:43 UTCGHSA enrichment
  10. 2026-10-08 19:22 UTCEG score recompute
  11. 2026-10-08 19:22 UTCGHSA enrichment
  12. 2026-10-08 16:36 UTCEPSS rescore
  13. 2026-10-08 15:00 UTCGHSA enrichment
  14. 2026-10-08 10:38 UTCGHSA enrichment
  15. 2026-10-08 06:14 UTCGHSA enrichment
  16. 2026-10-08 01:52 UTCEG score recompute
  17. 2026-10-08 01:52 UTCGHSA enrichment
  18. 2026-10-07 23:41 UTCEPSS rescore
  19. 2026-10-07 21:31 UTCGHSA enrichment
  20. 2026-10-07 17:09 UTCGHSA enrichment
  21. 2026-10-07 12:47 UTCGHSA enrichment
  22. 2026-10-07 08:26 UTCGHSA enrichment
  23. 2026-10-07 04:05 UTCGHSA enrichment
  24. 2026-10-06 23:43 UTCGHSA enrichment
  25. 2026-10-06 19:22 UTCEG score recompute
Show 75 more
  1. 2026-10-06 19:22 UTCGHSA enrichment
  2. 2026-10-06 15:12 UTCEPSS rescore
  3. 2026-10-06 15:01 UTCGHSA enrichment
  4. 2026-10-06 10:40 UTCGHSA enrichment
  5. 2026-10-06 06:16 UTCGHSA enrichment
  6. 2026-10-06 01:55 UTCGHSA enrichment
  7. 2026-10-05 21:34 UTCEG score recompute
  8. 2026-10-05 21:33 UTCGHSA enrichment
  9. 2026-10-05 17:39 UTCEPSS rescore
  10. 2026-10-05 17:09 UTCGHSA enrichment
  11. 2026-10-05 12:48 UTCGHSA enrichment
  12. 2026-10-05 08:28 UTCGHSA enrichment
  13. 2026-10-05 04:06 UTCGHSA enrichment
  14. 2026-10-04 23:45 UTCEG score recompute
  15. 2026-10-04 23:44 UTCGHSA enrichment
  16. 2026-10-04 23:18 UTCEPSS rescore
  17. 2026-10-04 19:23 UTCGHSA enrichment
  18. 2026-10-04 15:02 UTCGHSA enrichment
  19. 2026-10-04 10:40 UTCGHSA enrichment
  20. 2026-10-04 06:18 UTCGHSA enrichment
  21. 2026-10-04 01:57 UTCGHSA enrichment
  22. 2026-10-03 21:36 UTCGHSA enrichment
  23. 2026-10-03 17:14 UTCEG score recompute
  24. 2026-10-03 17:14 UTCGHSA enrichment
  25. 2026-10-03 14:21 UTCEPSS rescore
  26. 2026-10-03 14:21 UTCEPSS rescore
  27. 2026-10-03 12:53 UTCGHSA enrichment
  28. 2026-10-03 08:31 UTCGHSA enrichment
  29. 2026-10-03 04:07 UTCGHSA enrichment
  30. 2026-10-02 23:45 UTCGHSA enrichment
  31. 2026-10-02 19:23 UTCEG score recompute
  32. 2026-10-02 19:23 UTCGHSA enrichment
  33. 2026-10-02 15:01 UTCGHSA enrichment
  34. 2026-10-02 10:40 UTCGHSA enrichment
  35. 2026-10-02 06:12 UTCGHSA enrichment
  36. 2026-10-02 01:50 UTCGHSA enrichment
  37. 2026-10-01 21:29 UTCEG score recompute
  38. 2026-10-01 21:29 UTCGHSA enrichment
  39. 2026-10-01 17:08 UTCGHSA enrichment
  40. 2026-10-01 12:47 UTCGHSA enrichment
  41. 2026-10-01 08:26 UTCGHSA enrichment
  42. 2026-10-01 04:05 UTCGHSA enrichment
  43. 2026-09-30 23:43 UTCGHSA enrichment
  44. 2026-09-30 19:19 UTCEG score recompute
  45. 2026-09-30 19:19 UTCGHSA enrichment
  46. 2026-09-30 14:59 UTCEPSS rescore
  47. 2026-09-30 14:58 UTCGHSA enrichment
  48. 2026-09-30 10:37 UTCGHSA enrichment
  49. 2026-09-30 06:14 UTCGHSA enrichment
  50. 2026-09-30 01:52 UTCGHSA enrichment
  51. 2026-09-29 21:31 UTCGHSA enrichment
  52. 2026-09-29 17:07 UTCEG score recompute
  53. 2026-09-29 17:07 UTCGHSA enrichment
  54. 2026-09-29 12:46 UTCGHSA enrichment
  55. 2026-09-29 08:25 UTCGHSA enrichment
  56. 2026-09-29 04:03 UTCGHSA enrichment
  57. 2026-09-28 23:41 UTCEG score recompute
  58. 2026-09-28 23:41 UTCGHSA enrichment
  59. 2026-09-28 19:19 UTCGHSA enrichment
  60. 2026-09-28 14:56 UTCEG score recompute
  61. 2026-09-28 14:56 UTCGHSA enrichment
  62. 2026-09-28 13:45 UTCEPSS rescore
  63. 2026-09-28 10:34 UTCGHSA enrichment
  64. 2026-09-28 06:12 UTCGHSA enrichment
  65. 2026-09-28 01:51 UTCGHSA enrichment
  66. 2026-09-27 21:51 UTCCISA KEV update
  67. 2026-09-27 21:29 UTCGHSA enrichment
  68. 2026-09-27 17:07 UTCEG score recompute
  69. 2026-09-27 17:07 UTCGHSA enrichment
  70. 2026-09-27 13:40 UTCEPSS rescore
  71. 2026-09-27 13:40 UTCEPSS rescore
  72. 2026-09-27 12:46 UTCGHSA enrichment
  73. 2026-09-27 08:24 UTCGHSA enrichment
  74. 2026-09-27 04:04 UTCGHSA enrichment
  75. 2026-09-26 23:43 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 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 attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
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 (CRITICAL).
Which products are affected by CVE-2018-0155?
CVE-2018-0155 affects Cisco Catalyst 4500 Series Switches and Cisco Catalyst 4500-X Series Switches.
How do I remediate CVE-2018-0155?
No fix for CVE-2018-0155 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix.

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