CVE-2026-33921

MEDIUMPre-NVD 5.25.2—
EchelonGraph scoreMEDIUM confidence

Score 5.2 from GitHub Security Advisory published 2026-08-11. A secondary CVSS source baseline 5.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
5.2EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 5.2Exploit: None knownExposed services: Not assessed

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

The Windows installer deployed Npcap leaving its access restriction option at the insecure default value, so the driver was accessible to every local user of the host instead of being restricted to administrators only. A local user without administrative privileges could use the Npcap driver to capture the traffic reaching the host, which discloses information belonging both to the host and to other systems on the same network segment, and to send arbitrary raw packets on that segment.

CVSS v3
5.2
EG Score
5.2MEDIUMmedium confidence
EG Risk
23
EG Risk 23/100CISA 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
Severity52% × 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
2nd
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 28, 2026

Advisory Details (1)

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

NN-2026:14-01 - Npcap driver installed without administrator-only access restriction on Windows in Arc before v2.7.0 - CVE-2026-33921 | Product Security Incident Response Portal

https://security.nozominetworks.com/NN-2026:14-01

Vendor Advisories for CVE-2026-33921(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 / 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 130 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-33921?
CVE-2026-33921 is a medium vulnerability published on August 11, 2026. The Windows installer deployed Npcap leaving its access restriction option at the insecure default value, so the driver was accessible to every local user of the host instead of being restricted to administrators only. A local user without administrative privileges could use the Npcap driver to…
When was CVE-2026-33921 disclosed?
CVE-2026-33921 was first published on August 11, 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-2026-33921 actively exploited?
CVE-2026-33921 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (2nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-33921?
CVE-2026-33921 has a CVSS base score of 5.2 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-33921?
No fix for CVE-2026-33921 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-2026-33921 are linked in the Vendor Advisories panel on this page.

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