CVE-2026-86166

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-06. a secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
8.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.8Exploit: Elevated riskExposed: 0

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

A vulnerability was determined in Tenda HG10 300001138. This issue affects the function formWanRedirect of the file /boaform/formWanRedirect of the component Boa Web Server. Executing a manipulation of the argument if can lead to buffer overflow. The attack may be launched remotely. The exploit has been publicly disclosed and may be utilized.

CVSS v3
8.8
EG Score
8.8(high)
EG Risk
56(Track*)
EG Risk 56/100SSVC: 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
Severity88% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Watch closely — could escalate to Attend.
EPSS PROB
1%
EPSS %ILE
56%
KEV
Not listed

Published

September 6, 2026

Last Modified

September 11, 2026

Advisory Details (2)

Auto-updated Sep 6, 2026
No patch confirmed yet.
generic

腾达(Tenda) 官方网站 - 致力于建设值得信赖的好网络

https://www.tenda.com.cn/
generic

cuicuishark-sheep-fishIOT/Tenda/HG10/bof-formWanRedirect-if.md at main · SunnyYANGyaya/cuicuishark-sheep-fishIOT · GitHub

https://github.com/SunnyYANGyaya/cuicuishark-sheep-fishIOT/blob/main/Tenda/HG10/bof-formWanRedirect-if.md

Vendor Advisories for CVE-2026-86166(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 28× in last 7d / 81× 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. 2026-09-25 06:27 UTCGHSA enrichment
  2. 2026-09-24 19:00 UTCEG score recompute
  3. 2026-09-24 19:00 UTCGHSA enrichment
  4. 2026-09-24 14:04 UTCEPSS rescore
  5. 2026-09-24 07:33 UTCGHSA enrichment
  6. 2026-09-23 20:05 UTCEG score recompute
  7. 2026-09-23 20:05 UTCGHSA enrichment
  8. 2026-09-23 17:54 UTCEPSS rescore
  9. 2026-09-23 08:38 UTCGHSA enrichment
  10. 2026-09-22 21:11 UTCEG score recompute
  11. 2026-09-22 21:11 UTCGHSA enrichment
  12. 2026-09-22 16:01 UTCEPSS rescore
  13. 2026-09-22 09:44 UTCGHSA enrichment
  14. 2026-09-21 22:17 UTCEG score recompute
  15. 2026-09-21 22:17 UTCGHSA enrichment
  16. 2026-09-21 21:09 UTCEPSS rescore
  17. 2026-09-21 10:49 UTCGHSA enrichment
  18. 2026-09-20 23:22 UTCEG score recompute
  19. 2026-09-20 23:22 UTCGHSA enrichment
  20. 2026-09-20 20:16 UTCEPSS rescore
  21. 2026-09-20 11:54 UTCGHSA enrichment
  22. 2026-09-20 00:25 UTCEG score recompute
  23. 2026-09-20 00:25 UTCGHSA enrichment
  24. 2026-09-19 12:57 UTCGHSA enrichment
  25. 2026-09-19 01:30 UTCEG score recompute
Show 56 more
  1. 2026-09-19 01:30 UTCGHSA enrichment
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 13:59 UTCGHSA enrichment
  4. 2026-09-18 02:32 UTCEG score recompute
  5. 2026-09-18 02:32 UTCGHSA enrichment
  6. 2026-09-17 19:32 UTCEPSS rescore
  7. 2026-09-17 15:05 UTCGHSA enrichment
  8. 2026-09-17 03:38 UTCGHSA enrichment
  9. 2026-09-16 16:11 UTCEG score recompute
  10. 2026-09-16 16:10 UTCGHSA enrichment
  11. 2026-09-16 14:09 UTCEPSS rescore
  12. 2026-09-16 05:15 UTCEPSS rescore
  13. 2026-09-16 04:43 UTCGHSA enrichment
  14. 2026-09-15 17:16 UTCGHSA enrichment
  15. 2026-09-15 05:48 UTCEG score recompute
  16. 2026-09-15 05:48 UTCGHSA enrichment
  17. 2026-09-15 03:12 UTCEPSS rescore
  18. 2026-09-15 03:12 UTCEPSS rescore
  19. 2026-09-14 18:21 UTCGHSA enrichment
  20. 2026-09-14 06:40 UTCGHSA enrichment
  21. 2026-09-13 19:13 UTCEG score recompute
  22. 2026-09-13 19:13 UTCGHSA enrichment
  23. 2026-09-13 07:45 UTCGHSA enrichment
  24. 2026-09-12 20:19 UTCEG score recompute
  25. 2026-09-12 20:19 UTCGHSA enrichment
  26. 2026-09-12 08:51 UTCGHSA enrichment
  27. 2026-09-11 21:24 UTCEG score recompute
  28. 2026-09-11 21:24 UTCGHSA enrichment
  29. 2026-09-11 21:20 UTCNVD updateCVSS v4 → 7.4
  30. 2026-09-11 20:47 UTCEG score recompute
  31. 2026-09-11 20:47 UTCGHSA enrichment
  32. 2026-09-11 20:43 UTCMITRE cvelistV5CVSS v4 → 8.7
  33. 2026-09-11 14:53 UTCEPSS rescore
  34. 2026-09-11 14:53 UTCEPSS rescore
  35. 2026-09-11 11:44 UTCEG score recompute
  36. 2026-09-11 11:44 UTCGHSA enrichment
  37. 2026-09-10 23:50 UTCGHSA enrichment
  38. 2026-09-10 12:05 UTCEG score recompute
  39. 2026-09-10 12:05 UTCGHSA enrichment
  40. 2026-09-10 00:37 UTCGHSA enrichment
  41. 2026-09-09 13:10 UTCGHSA enrichment
  42. 2026-09-09 01:41 UTCEG score recompute
  43. 2026-09-09 01:41 UTCGHSA enrichment
  44. 2026-09-08 22:01 UTCEPSS rescore
  45. 2026-09-08 14:14 UTCGHSA enrichment
  46. 2026-09-08 02:17 UTCEG score recompute
  47. 2026-09-08 02:17 UTCGHSA enrichment
  48. 2026-09-07 14:50 UTCGHSA enrichment
  49. 2026-09-07 03:22 UTCGHSA enrichment
  50. 2026-09-06 15:53 UTCEG score recompute
  51. 2026-09-06 15:53 UTCGHSA enrichment
  52. 2026-09-06 13:48 UTCEPSS rescore
  53. 2026-09-06 04:25 UTCEG score recompute
  54. 2026-09-06 04:25 UTCNVD updateCVSS v4 → 7.4
  55. 2026-09-06 04:10 UTCEG score recompute
  56. 2026-09-06 04:10 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-86166?
CVE-2026-86166 is a high vulnerability published on September 6, 2026. A vulnerability was determined in Tenda HG10 300001138. This issue affects the function formWanRedirect of the file /boaform/formWanRedirect of the component Boa Web Server. Executing a manipulation of the argument if can lead to buffer overflow. The attack may be launched remotely. The exploit has…
When was CVE-2026-86166 disclosed?
CVE-2026-86166 was first published in the National Vulnerability Database on September 6, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-86166 actively exploited?
CVE-2026-86166 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.5% of all scored CVEs.
What is the CVSS score of CVE-2026-86166?
CVE-2026-86166 has a CVSS v3 base score of 8.8 (NVD).
How do I remediate CVE-2026-86166?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-86166, 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.

Dependency Blast Radius

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