CVE-2026-20466

MEDIUMPre-NVD 6.16.1—
EchelonGraph scoreMEDIUM confidence

Score 6.1 from GitHub Security Advisory published 2026-08-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
6.1EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 6.1Exploit: None knownExposed services: Not assessed

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

In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: AUTO00845351 (Note: For MT2737) / ALPS11072643 (Note: For MT6880, MT6890, MT6990); Issue ID: MSV-6929.

CVSS v3
6.1
EG Score
6.1MEDIUMmedium confidence
EG Risk
28
EG Risk 28/100CISA 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
Severity61% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at low or medium mission impact; Track* at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.2%
EPSS %ILE
5th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (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

August 3, 2026

Last Modified

August 28, 2026

Advisory Details (1)

Auto-updated Aug 3, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

August 2026 MediaTek Security Bulletin

https://www.mediatek.com/product-security-bulletin/August-2026

Vendor Advisories for CVE-2026-20466(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 64× 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 157 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-20466?
CVE-2026-20466 is a medium vulnerability published on August 3, 2026. In sec boot, there is a possible escalation of privilege due to a heap buffer overflow. This could lead to local escalation of privilege, if an attacker has physical access to the device, with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID:…
When was CVE-2026-20466 disclosed?
CVE-2026-20466 was first published on August 3, 2026, with the most recent update on August 28, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20466 actively exploited?
CVE-2026-20466 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (5th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-20466?
CVE-2026-20466 has a CVSS v3.1 base score of 6.1 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-20466?
No fix for CVE-2026-20466 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-2026-20466 are linked in the Vendor Advisories panel on this page.

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