CVE-2017-12237

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.

A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS 15.0 through 15.6 and Cisco IOS XE 3.5 through 16.5 could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of service (DoS) condition. The vulnerability is due to how an affected device processes certain IKEv2 packets. An attacker could exploit this vulnerability by sending specific IKEv2 packets to an affected device to be processed. A successful exploit could allow the attacker to cause high CPU utilization, traceback messages, or a reload of the affected device that leads to a DoS condition. This vulnerability affects Cisco devices that have the Internet Security Association and Key Management Protocol (ISAKMP) enabled. Although only IKEv2 packets can be used to trigger this vulnerability, devices that are running Cisco IOS Software or Cisco IOS XE Software are vulnerable when ISAKMP is enabled. A device does not need to be configured with any IKEv2-specific features to be vulnerable. Many features use IKEv2, including different types of VPNs such as the following: LAN-to-LAN VPN; Remote-access VPN, excluding SSL VPN; Dynamic Multipoint VPN (DMVPN); and FlexVPN. Cisco Bug IDs: CSCvc41277.

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 19, 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-2017-12237
generic🔴 Active Exploitation

Cisco IOS and IOS XE Software Internet Key Exchange Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-ike
generic
http://www.securitytracker.com/id/1039460
generic
http://www.securityfocus.com/bid/101037

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 40× in last 7d / 210× 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. 2026-07-27 19:24 UTCCISA KEV update
  2. 2026-07-27 17:43 UTCEG score recompute
  3. 2026-07-27 17:43 UTCGHSA enrichment
  4. 2026-07-27 17:17 UTCCISA KEV update
  5. 2026-07-27 13:22 UTCGHSA enrichment
  6. 2026-07-27 09:01 UTCGHSA enrichment
  7. 2026-07-27 04:40 UTCGHSA enrichment
  8. 2026-07-27 00:19 UTCGHSA enrichment
  9. 2026-07-26 19:56 UTCGHSA enrichment
  10. 2026-07-26 15:35 UTCEG score recompute
  11. 2026-07-26 15:35 UTCGHSA enrichment
  12. 2026-07-26 14:51 UTCEPSS rescore
  13. 2026-07-26 11:13 UTCEG score recompute
  14. 2026-07-26 11:13 UTCGHSA enrichment
  15. 2026-07-26 06:51 UTCGHSA enrichment
  16. 2026-07-26 02:30 UTCEG score recompute
  17. 2026-07-26 02:30 UTCGHSA enrichment
  18. 2026-07-25 14:13 UTCEPSS rescore
  19. 2026-07-23 14:15 UTCEPSS rescore
  20. 2026-07-23 01:26 UTCEG score recompute
  21. 2026-07-22 22:41 UTCGHSA enrichment
  22. 2026-07-22 22:05 UTCEG score recompute
  23. 2026-07-22 19:40 UTCCISA KEV update
  24. 2026-07-22 18:20 UTCEG score recompute
  25. 2026-07-22 18:19 UTCGHSA enrichment
Show 75 more
  1. 2026-07-22 14:04 UTCEPSS rescore
  2. 2026-07-22 13:58 UTCGHSA enrichment
  3. 2026-07-22 09:37 UTCGHSA enrichment
  4. 2026-07-22 05:16 UTCGHSA enrichment
  5. 2026-07-22 00:55 UTCGHSA enrichment
  6. 2026-07-21 20:32 UTCGHSA enrichment
  7. 2026-07-21 16:10 UTCEG score recompute
  8. 2026-07-21 16:10 UTCGHSA enrichment
  9. 2026-07-21 15:21 UTCEPSS rescore
  10. 2026-07-21 15:21 UTCEPSS rescore
  11. 2026-07-21 14:37 UTCCISA KEV update
  12. 2026-07-21 11:49 UTCGHSA enrichment
  13. 2026-07-21 07:25 UTCGHSA enrichment
  14. 2026-07-21 03:05 UTCGHSA enrichment
  15. 2026-07-20 22:44 UTCGHSA enrichment
  16. 2026-07-20 18:23 UTCEG score recompute
  17. 2026-07-20 18:23 UTCGHSA enrichment
  18. 2026-07-20 17:04 UTCEPSS rescore
  19. 2026-07-20 17:04 UTCEPSS rescore
  20. 2026-07-20 14:02 UTCGHSA enrichment
  21. 2026-07-20 09:41 UTCGHSA enrichment
  22. 2026-07-20 05:20 UTCGHSA enrichment
  23. 2026-07-19 20:38 UTCGHSA enrichment
  24. 2026-07-19 16:17 UTCEG score recompute
  25. 2026-07-19 16:17 UTCGHSA enrichment
  26. 2026-07-19 14:28 UTCEPSS rescore
  27. 2026-07-19 14:28 UTCEPSS rescore
  28. 2026-07-19 11:57 UTCGHSA enrichment
  29. 2026-07-19 07:36 UTCGHSA enrichment
  30. 2026-07-19 03:15 UTCEG score recompute
  31. 2026-07-19 03:14 UTCGHSA enrichment
  32. 2026-07-19 02:26 UTCEPSS rescore
  33. 2026-07-19 02:26 UTCEPSS rescore
  34. 2026-07-18 22:52 UTCGHSA enrichment
  35. 2026-07-18 18:31 UTCGHSA enrichment
  36. 2026-07-18 14:10 UTCEG score recompute
  37. 2026-07-18 14:10 UTCGHSA enrichment
  38. 2026-07-18 10:00 UTCEPSS rescore
  39. 2026-07-18 09:49 UTCGHSA enrichment
  40. 2026-07-18 05:27 UTCGHSA enrichment
  41. 2026-07-18 01:06 UTCGHSA enrichment
  42. 2026-07-17 20:45 UTCGHSA enrichment
  43. 2026-07-17 16:24 UTCGHSA enrichment
  44. 2026-07-17 12:03 UTCGHSA enrichment
  45. 2026-07-17 07:42 UTCEG score recompute
  46. 2026-07-17 07:42 UTCGHSA enrichment
  47. 2026-07-17 03:21 UTCGHSA enrichment
  48. 2026-07-16 23:00 UTCGHSA enrichment
  49. 2026-07-16 18:39 UTCGHSA enrichment
  50. 2026-07-16 17:04 UTCCISA KEV update
  51. 2026-07-16 16:59 UTCEPSS rescore
  52. 2026-07-16 16:59 UTCEPSS rescore
  53. 2026-07-16 14:18 UTCGHSA enrichment
  54. 2026-07-16 09:57 UTCGHSA enrichment
  55. 2026-07-16 05:36 UTCGHSA enrichment
  56. 2026-07-16 01:15 UTCGHSA enrichment
  57. 2026-07-15 20:54 UTCGHSA enrichment
  58. 2026-07-15 16:54 UTCEPSS rescore
  59. 2026-07-15 16:54 UTCEPSS rescore
  60. 2026-07-15 16:49 UTCCISA KEV update
  61. 2026-07-15 16:33 UTCGHSA enrichment
  62. 2026-07-15 15:04 UTCCISA KEV update
  63. 2026-07-15 12:11 UTCGHSA enrichment
  64. 2026-07-15 07:50 UTCGHSA enrichment
  65. 2026-07-15 03:29 UTCGHSA enrichment
  66. 2026-07-15 01:56 UTCEPSS rescore
  67. 2026-07-14 23:08 UTCGHSA enrichment
  68. 2026-07-14 18:45 UTCGHSA enrichment
  69. 2026-07-14 18:05 UTCCISA KEV update
  70. 2026-07-14 14:24 UTCGHSA enrichment
  71. 2026-07-14 10:03 UTCGHSA enrichment
  72. 2026-07-14 05:42 UTCGHSA enrichment
  73. 2026-07-14 01:21 UTCGHSA enrichment
  74. 2026-07-13 22:26 UTCEPSS rescore
  75. 2026-07-13 21:00 UTCGHSA enrichment

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Frequently asked(6)

What is CVE-2017-12237?
CVE-2017-12237 is a critical vulnerability published on September 29, 2017. A vulnerability in the Internet Key Exchange Version 2 (IKEv2) module of Cisco IOS 15.0 through 15.6 and Cisco IOS XE 3.5 through 16.5 could allow an unauthenticated, remote attacker to cause high CPU utilization, traceback messages, or a reload of an affected device that leads to a denial of…
When was CVE-2017-12237 disclosed?
CVE-2017-12237 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-2017-12237 actively exploited?
Yes. CISA added CVE-2017-12237 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco IOS and IOS XE Software. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2017-12237?
CVE-2017-12237 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-2017-12237?
CVE-2017-12237 affects Cisco IOS and 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-2017-12237?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12237, 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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