CVE-2018-0171

CRITICALNVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score elevated to 9.8 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2021-11-03), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 9.8 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
9.8
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 100%CVSS: 9.8Exploit: 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, or to execute arbitrary code on an affected device. The vulnerability is due to improper validation of packet data. An attacker could exploit this vulnerability by sending a crafted Smart Install message to an affected device on TCP port 4786. A successful exploit could allow the attacker to cause a buffer overflow on the affected device, which could have the following impacts: Triggering a reload of the device, Allowing the attacker to execute arbitrary code on the device, Causing an indefinite loop on the affected device that triggers a watchdog crash. Cisco Bug IDs: CSCvg76186.

CVSS v3
9.8
EG Score
9.8(high)
EG Risk
99(Act)
EG Risk 99/100SSVC: Act

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
Severity98% × 45%
Exploitation100% × 40%
Automatability100% × 15%
Action: Fix now — active exploitation, automatable, high impact.
EPSS
99.9%
KEV
⚠ Exploited

Published

March 28, 2018

Last Modified

January 14, 2026

Advisory Details (4)

Auto-updated Jun 1, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic
http://www.securitytracker.com/id/1040580
generic
http://www.securityfocus.com/bid/103538
generic🟡 PoC Available

Attackers Exploit Cisco Switch Issue as Vendor Warns of Yet Another Critical Flaw

https://www.darkreading.com/perimeter/attackers-exploit-cisco-switch-issue-as-vendor-warns-of-yet-another-critical-flaw/d/d-id/1331490
generic🔴 Active Exploitation

Cisco IOS and IOS XE Software Smart Install Remote Code Execution Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180328-smi2

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 46× in last 7d / 193× 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 361 total refreshes for this CVE.

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

Publicly available exploits

(3 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCAlrikRr/Cisco-Smart-Exploit
    First seen Feb 1, 2023

    Cisco SmartInstall Exploit [CVE-2018-0171]

    Open source ↗
  • Exploit-DBEDB-44451
    First seen Mar 29, 2018

    Cisco Smart Install - Crash (PoC)

    Open source ↗
  • Nucleijavascript/cves/2018/CVE-2018-0171.yaml
    First seen Jan 1, 2018

    Cisco Smart Install - Configuration Download

    Open source ↗

Related CVEs(same CWE)

Frequently asked(6)

What is CVE-2018-0171?
CVE-2018-0171 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, or to execute arbitrary code on an affected device. The…
When was CVE-2018-0171 disclosed?
CVE-2018-0171 was first published in the National Vulnerability Database on March 28, 2018, with the most recent update on January 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2018-0171 actively exploited?
Yes. CISA added CVE-2018-0171 to the Known Exploited Vulnerabilities catalog on November 3, 2021, affecting Cisco IOS and IOS XE. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2018-0171?
CVE-2018-0171 has a CVSS v3 base score of 9.8 (NVD).
Which products are affected by CVE-2018-0171?
CVE-2018-0171 affects Cisco IOS and IOS XE. 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-2018-0171?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-0171, 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.

Dependency Blast Radius

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