CVE-2026-100740

CRITICALPre-NVD 9.99.9—
EchelonGraph scoreHIGH confidence

Score 9.9 from GitHub Security Advisory (severity: HIGH) published 2026-09-27. A secondary CVSS source baseline 9.9; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 5 sources updated this weekElevated
9.9EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 9.9Exploit: Elevated riskExposed services: Not assessed

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

A vulnerability was detected in D-Link DIR-895L A1_102b07. Impacted is the function tunnel_set_params of the file tunnel.c of the component L2TP Control Channel Parser. Performing a manipulation results in out-of-bounds write. The attack may be initiated remotely. The exploit is now public and may be used.

CVSS v3
9.9
EG Score
9.9CRITICALhigh confidence
EG Risk
61
EG Risk 61/100CISA SSVC

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
Severity99% × 45%
Exploitation40% × 40%
Automatability0% × 15%
CISA SSVC: Track at low, Track* at medium and Attend at high mission impact.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
37th
KEV
Not listed

CISA SSVCTrack at low, Track* at medium and Attend at high mission impact.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high, and watch the vendor's advisory for the fix.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

September 27, 2026

Last Modified

September 28, 2026

Advisory Details (2)

Auto-updated Sep 28, 2026
No patch confirmed yet.
generic

Smart Home, SMB and Enterprise solutions | D-Link

https://www.dlink.com/
generic

Notion

https://tzh00203.notion.site/D-Link-DIR-895L-L2TP-Host-Name-AVP-Out-of-Bounds-Write-33cb5c52018a8061b139cacc39d58fff

Vendor Advisories for CVE-2026-100740(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 60× in last 7d / 68× 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. 2026-10-04 12:45 UTCGHSA enrichment
  2. 2026-10-04 08:44 UTCGHSA enrichment
  3. 2026-10-04 04:43 UTCGHSA enrichment
  4. 2026-10-04 00:43 UTCGHSA enrichment
  5. 2026-10-03 20:44 UTCGHSA enrichment
  6. 2026-10-03 16:41 UTCEG score recompute
  7. 2026-10-03 16:41 UTCGHSA enrichment
  8. 2026-10-03 14:25 UTCEPSS rescore
  9. 2026-10-03 12:42 UTCGHSA enrichment
  10. 2026-10-03 08:42 UTCGHSA enrichment
  11. 2026-10-03 04:40 UTCGHSA enrichment
  12. 2026-10-03 00:38 UTCGHSA enrichment
  13. 2026-10-02 20:38 UTCGHSA enrichment
  14. 2026-10-02 16:35 UTCEG score recompute
  15. 2026-10-02 16:34 UTCGHSA enrichment
  16. 2026-10-02 12:33 UTCGHSA enrichment
  17. 2026-10-02 08:32 UTCGHSA enrichment
  18. 2026-10-02 04:33 UTCGHSA enrichment
  19. 2026-10-02 00:30 UTCGHSA enrichment
  20. 2026-10-01 20:30 UTCEG score recompute
  21. 2026-10-01 20:30 UTCGHSA enrichment
  22. 2026-10-01 19:49 UTCEPSS rescore
  23. 2026-10-01 16:18 UTCGHSA enrichment
  24. 2026-10-01 12:18 UTCGHSA enrichment
  25. 2026-10-01 08:17 UTCGHSA enrichment
Show 43 more
  1. 2026-10-01 04:17 UTCGHSA enrichment
  2. 2026-10-01 00:17 UTCGHSA enrichment
  3. 2026-09-30 20:17 UTCGHSA enrichment
  4. 2026-09-30 16:17 UTCEG score recompute
  5. 2026-09-30 16:17 UTCGHSA enrichment
  6. 2026-09-30 15:02 UTCEPSS rescore
  7. 2026-09-30 11:48 UTCGHSA enrichment
  8. 2026-09-30 07:48 UTCGHSA enrichment
  9. 2026-09-30 03:47 UTCGHSA enrichment
  10. 2026-09-29 23:47 UTCGHSA enrichment
  11. 2026-09-29 19:39 UTCGHSA enrichment
  12. 2026-09-29 15:33 UTCEG score recompute
  13. 2026-09-29 15:33 UTCGHSA enrichment
  14. 2026-09-29 15:20 UTCEPSS rescore
  15. 2026-09-29 11:33 UTCGHSA enrichment
  16. 2026-09-29 07:33 UTCGHSA enrichment
  17. 2026-09-29 03:33 UTCGHSA enrichment
  18. 2026-09-28 23:32 UTCEG score recompute
  19. 2026-09-28 23:32 UTCGHSA enrichment
  20. 2026-09-28 19:32 UTCEG score recompute
  21. 2026-09-28 19:32 UTCGHSA enrichment
  22. 2026-09-28 15:26 UTCEG score recompute
  23. 2026-09-28 15:26 UTCGHSA enrichment
  24. 2026-09-28 15:25 UTCNVD updateCVSS v4 → 8.6
  25. 2026-09-28 14:57 UTCEG score recompute
  26. 2026-09-28 14:57 UTCGHSA enrichment
  27. 2026-09-28 14:56 UTCMITRE cvelistV5CVSS v4 → 9.4
  28. 2026-09-28 13:50 UTCEPSS rescore
  29. 2026-09-28 13:33 UTCGHSA enrichment
  30. 2026-09-28 09:33 UTCGHSA enrichment
  31. 2026-09-28 05:33 UTCGHSA enrichment
  32. 2026-09-28 01:33 UTCGHSA enrichment
  33. 2026-09-27 21:33 UTCGHSA enrichment
  34. 2026-09-27 17:33 UTCEG score recompute
  35. 2026-09-27 17:33 UTCGHSA enrichment
  36. 2026-09-27 13:32 UTCGHSA enrichment
  37. 2026-09-27 09:32 UTCGHSA enrichment
  38. 2026-09-27 05:32 UTCEG score recompute
  39. 2026-09-27 05:32 UTCGHSA enrichment
  40. 2026-09-27 01:28 UTCEG score recompute
  41. 2026-09-27 01:23 UTCNVD updateCVSS v4 → 8.6
  42. 2026-09-27 00:49 UTCEG score recompute
  43. 2026-09-27 00:49 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-100740?
CVE-2026-100740 is a critical vulnerability published on September 27, 2026. A vulnerability was detected in D-Link DIR-895L A1102b07. Impacted is the function tunnelset_params of the file tunnel.c of the component L2TP Control Channel Parser. Performing a manipulation results in out-of-bounds write. The attack may be initiated remotely. The exploit is now public and may be…
When was CVE-2026-100740 disclosed?
CVE-2026-100740 was first published on September 27, 2026, with the most recent update on September 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-100740 actively exploited?
CVE-2026-100740 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (37th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-100740?
CVE-2026-100740 has a CVSS base score of 9.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-100740?
No fix for CVE-2026-100740 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-100740 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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