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
79%
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 45× in last 7d / 236× 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 500 total refreshes for this CVE.

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

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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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