CVE-2017-12238

MEDIUMNVD 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
6.5
EchelonGraph verdictPatch nowTreat as an emergency — this is being exploited.
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS: 2%CVSS: 6.5Exploit: NoneExposed: 0

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

A vulnerability in the 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)
EPSS
78.8%
KEV
⚠ Exploited

Published

September 29, 2017

Last Modified

April 21, 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

Data Freshness Timeline

(refreshed 100× in last 7d / 434× 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 584 total refreshes for this CVE.

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

Frequently asked(6)

What is CVE-2017-12238?
CVE-2017-12238 is a medium 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 April 21, 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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