CVE-2017-12238

CRITICALNVD 6.59.0▲
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 6.5 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: 2%CVSS: 6.5Exploit: 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 Virtual Private LAN Service (VPLS) code of Cisco IOS 15.0 through 15.4 for Cisco Catalyst 6800 Series Switches could allow an unauthenticated, adjacent attacker to cause a C6800-16P10G or C6800-16P10G-XL type line card to crash, resulting in a denial of service (DoS) condition. The vulnerability is due to a memory management issue in the affected software. An attacker could exploit this vulnerability by creating a large number of VPLS-generated MAC entries in the MAC address table of an affected device. A successful exploit could allow the attacker to cause a C6800-16P10G or C6800-16P10G-XL type line card to crash, resulting in a DoS condition. This vulnerability affects Cisco Catalyst 6800 Series Switches that are running a vulnerable release of Cisco IOS Software and have a Cisco C6800-16P10G or C6800-16P10G-XL line card in use with Supervisor Engine 6T. To be vulnerable, the device must also be configured with VPLS and the C6800-16P10G or C6800-16P10G-XL line card needs to be the core-facing MPLS interfaces. Cisco Bug IDs: CSCva61927.

CVSS v3
6.5
EG Score
9.0(high)
EG Risk
81(Attend)
EG Risk 81/100SSVC: 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%
Automatability0% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
2%
EPSS %ILE
80%
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-2017-12238
generic

Cisco IOS Software for Cisco Catalyst 6800 Series Switches VPLS Denial of Service Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-vpls
generic
http://www.securitytracker.com/id/1039453
generic
http://www.securityfocus.com/bid/101040

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 61× in last 7d / 261× 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 968 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2017-12238?
CVE-2017-12238 is a critical vulnerability published on September 29, 2017. A vulnerability in the Virtual Private LAN Service (VPLS) code of Cisco IOS 15.0 through 15.4 for Cisco Catalyst 6800 Series Switches could allow an unauthenticated, adjacent attacker to cause a C6800-16P10G or C6800-16P10G-XL type line card to crash, resulting in a denial of service (DoS)…
When was CVE-2017-12238 disclosed?
CVE-2017-12238 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-2017-12238 actively exploited?
Yes. CISA added CVE-2017-12238 to the Known Exploited Vulnerabilities catalog on March 3, 2022, affecting Cisco Catalyst 6800 Series Switches. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate patching attention.
What is the CVSS score of CVE-2017-12238?
CVE-2017-12238 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0.
Which products are affected by CVE-2017-12238?
CVE-2017-12238 affects Cisco Catalyst 6800 Series Switches. 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-2017-12238?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12238, 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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