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 62× in last 7d / 244× 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 439 total refreshes for this CVE.

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

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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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