CVE-2026-21399

MEDIUMPre-NVD 6.96.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 6.9 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.1% (1st percentile of EPSS-scored CVEs). 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: epss, secondary
Trending — 3 sources updated this week
6.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 6.9Exploit: None knownExposed services: Not assessed

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

Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R) before version 2.0.2 within Ring 3: User Applications may allow a denial of service. System software adversary with an authenticated user combined with a low complexity attack may enable denial of service. This result may potentially occur via local access when attack requirements are not present without special internal knowledge and requires no user interaction. The potential vulnerability may impact the confidentiality (none), integrity (low) and availability (high) of the vulnerable system, resulting in subsequent system confidentiality (none), integrity (none) and availability (none) impacts.

CVSS v3
6.9
EG Score
6.9MEDIUMmedium confidence
EG Risk
31
EG Risk 31/100CISA 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
Severity69% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
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
0.1%
EPSS %ILE
1st
KEV
Not listed

CISA SSVCTrack at every mission impact level.

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 partial (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 11, 2026

Last Modified

August 12, 2026

Advisory Details (1)

Auto-updated Aug 11, 2026
No patch confirmed yet.
generic

INTEL-SA-01459

https://intel.com/content/www/us/en/security-center/advisory/intel-sa-01459.html

Vendor Advisories for CVE-2026-21399(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 10× in last 7d / 63× 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 133 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-21399?
CVE-2026-21399 is a medium vulnerability published on August 11, 2026. Heap-based buffer overflow for the Intel(R) Open Volume Kernel Library (Intel(R) Open VKL) library maintained by intel(R) before version 2.0.2 within Ring 3: User Applications may allow a denial of service. System software adversary with an authenticated user combined with a low complexity attack…
When was CVE-2026-21399 disclosed?
CVE-2026-21399 was first published on August 11, 2026, with the most recent update on August 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21399 actively exploited?
CVE-2026-21399 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-21399?
CVE-2026-21399 has a CVSS base score of 6.9 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-21399?
No fix for CVE-2026-21399 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-2026-21399 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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