CVE-2018-0156

HIGHNVD 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 — 4 sources updated this weekExploited in the wild
7.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 8%CVSS: 7.5Exploit: NoneExposed: 0

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

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
9.0(high)
EPSS
94.3%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 13, 2026

Advisory Details (3)

Auto-updated Jun 7, 2026
⚠️ Active exploitation confirmed. No patch confirmed 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 97× in last 7d / 418× 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 594 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2018-0156?
CVE-2018-0156 is a high 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 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-2018-0156 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 patching attention.
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.
Which products are affected by CVE-2018-0156?
CVE-2018-0156 affects Cisco IOS Software and Cisco IOS XE Software. 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-2018-0156?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0156, 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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