CVE-2026-40677

HIGHPre-NVD 7.77.7—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.7 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 65% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: cna:amd, epss
7.7
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.7Exploit: NoneExposed: 0

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

The use of insecure HTTP transport within AMD optional tools could allow an attacker to conduct a man-in-the-middle attack, potentially leading to arbitrary code execution.

CVSS v3
7.7
EG Score
7.7(medium)
EG Risk
—
EPSS
35.5%
KEV
Not listed

Published

June 12, 2026

Last Modified

June 13, 2026

References (1)

Vendor Advisories for CVE-2026-40677(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 8× in last 7d / 79× 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 114 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-40677?
CVE-2026-40677 is a high vulnerability published on June 12, 2026. The use of insecure HTTP transport within AMD optional tools could allow an attacker to conduct a man-in-the-middle attack, potentially leading to arbitrary code execution.
When was CVE-2026-40677 disclosed?
CVE-2026-40677 was first published in the National Vulnerability Database on June 12, 2026, with the most recent update on June 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-40677 actively exploited?
CVE-2026-40677 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 35.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-40677?
CVE-2026-40677 has a CVSS v4.0 base score of 7.7 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-40677?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-40677, 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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