CVE-2017-12236

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 3%CVSS: 9.8Exploit: NoneExposed: 0

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

A vulnerability in the implementation of the Locator/ID Separation Protocol (LISP) in Cisco IOS XE 3.2 through 16.5 could allow an unauthenticated, remote attacker using an x tunnel router to bypass authentication checks performed when registering an Endpoint Identifier (EID) to a Routing Locator (RLOC) in the map server/map resolver (MS/MR). The vulnerability is due to a logic error introduced via a code regression for the affected software. An attacker could exploit this vulnerability by sending specific valid map-registration requests, which will be accepted by the MS/MR even if the authentication keys do not match, to the affected software. A successful exploit could allow the attacker to inject invalid mappings of EIDs to RLOCs in the MS/MR of the affected software. This vulnerability affects Cisco devices that are configured with LISP acting as an IPv4 or IPv6 map server. This vulnerability affects Cisco IOS XE Software release trains 3.9E and Everest 16.4. Cisco Bug IDs: CSCvc18008.

CVSS v3
9.8
EG Score
9.8(medium)
EPSS
86.3%
KEV
Not listed

Published

September 29, 2017

Last Modified

May 13, 2026

Advisory Details (3)

Auto-updated May 17, 2026
No patch confirmed yet.
generic

Cisco IOS XE Software Locator/ID Separation Protocol Authentication Bypass Vulnerability

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20170927-lisp
generic
http://www.securitytracker.com/id/1039448
generic
http://www.securityfocus.com/bid/101033

Data Freshness Timeline

(refreshed 9× in last 7d / 32× 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.

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

Frequently asked(5)

What is CVE-2017-12236?
CVE-2017-12236 is a critical vulnerability published on September 29, 2017. A vulnerability in the implementation of the Locator/ID Separation Protocol (LISP) in Cisco IOS XE 3.2 through 16.5 could allow an unauthenticated, remote attacker using an x tunnel router to bypass authentication checks performed when registering an Endpoint Identifier (EID) to a Routing Locator…
When was CVE-2017-12236 disclosed?
CVE-2017-12236 was first published in the National Vulnerability Database on September 29, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2017-12236 actively exploited?
CVE-2017-12236 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 86.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2017-12236?
CVE-2017-12236 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-12236?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2017-12236, 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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