CVE-2026-40621

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-13. 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: 0%CVSS: 9.8Exploit: NoneExposed: 0

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

ELECOM wireless LAN access point devices do not require authentication to access some specific URLs. The affected product may be operated without authentication.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
59(Track)
EG Risk 59/100SSVC: Track

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
Severity98% × 45%
Exploitation0% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
39.3%
KEV
Not listed

Published

May 13, 2026

Last Modified

May 13, 2026

Advisory Details (1)

Auto-updated Jun 21, 2026
No patch confirmed yet.
generic

JVN#03037325: Multiple vulnerabilities in ELECOM wireless LAN routers and access points (May 2026)

https://jvn.jp/en/jp/JVN03037325/

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 46× 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 183 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-40621?
CVE-2026-40621 is a critical vulnerability published on May 13, 2026. ELECOM wireless LAN access point devices do not require authentication to access some specific URLs. The affected product may be operated without authentication.
When was CVE-2026-40621 disclosed?
CVE-2026-40621 was first published in the National Vulnerability Database 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-2026-40621 actively exploited?
CVE-2026-40621 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 39.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40621?
CVE-2026-40621 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-40621?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40621, 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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