CVE-2017-12234

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 — 4 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 7%CVSS: 7.5Exploit: cisa kev · ssvc activeExposed: 0

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

Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the improper parsing of crafted CIP packets destined to an affected device. An attacker could exploit these vulnerabilities by sending crafted CIP packets to be processed by an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a DoS condition. Cisco Bug IDs: CSCvc43709.

CVSS v3
7.5
EG Score
9.0(high)
EG Risk
96(Attend)
EG Risk 96/100SSVC: Attend

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%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
7%
EPSS %ILE
94%
KEV
⚠ Exploited

Published

September 29, 2017

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated May 20, 2026
⚠️ Active exploitation confirmed. Patch available. Sources: cisa.
cisa Patch Available🔴 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-2017-12234
generic🔴 Active Exploitation

Cisco IOS Software Common Industrial Protocol Request Denial of Service Vulnerabilities

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-cip
generic
http://www.securitytracker.com/id/1039459
generic
http://www.securityfocus.com/bid/101038

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 55× in last 7d / 242× 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 813 total refreshes for this CVE.

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

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Frequently asked(6)

What is CVE-2017-12234?
CVE-2017-12234 is a critical vulnerability published on September 29, 2017. Multiple vulnerabilities in the implementation of the Common Industrial Protocol (CIP) feature in Cisco IOS 12.4 through 15.6 could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerabilities are due to the…
When was CVE-2017-12234 disclosed?
CVE-2017-12234 was first published in the National Vulnerability Database on September 29, 2017, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-12234 actively exploited?
Yes. CISA added CVE-2017-12234 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2017-12234?
CVE-2017-12234 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-2017-12234?
CVE-2017-12234 affects Cisco IOS 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-2017-12234?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12234, 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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