CVE-2018-0156

CRITICALNVD 7.59.0▲
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 7.5 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: 9.4%CVSS: 7.5Exploit: cisa kev · ssvc active · epss top5pctExposed 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 Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted packet to an affected device on TCP port 4786. Only Smart Install client switches are affected. Cisco devices that are configured as a Smart Install director are not affected by this vulnerability. Cisco Bug IDs: CSCvd40673.

CVSS v3
7.5
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
9.4%
EPSS %ILE
95th
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 (3)

Auto-updated Jun 7, 2026
⚠️ Active exploitation confirmed. No fix on record yet.
generic🔴 Active Exploitation

Cisco IOS and IOS XE Software Smart Install Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi
generic
http://www.securitytracker.com/id/1040596
generic
http://www.securityfocus.com/bid/103569

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 59× in last 7d / 254× 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 1,086 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-0156?
CVE-2018-0156 is a critical vulnerability published on March 28, 2018. A vulnerability in the Smart Install feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to trigger a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to improper validation of packet data.…
When was CVE-2018-0156 disclosed?
CVE-2018-0156 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-2018-0156 actively exploited?
Yes. CISA added CVE-2018-0156 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS Software and Cisco IOS XE Software. 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-2018-0156?
CVE-2018-0156 has a CVSS v3 base score of 7.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2018-0156?
CVE-2018-0156 affects Cisco IOS Software and Cisco IOS XE Software.
How do I remediate CVE-2018-0156?
No fix for CVE-2018-0156 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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