CVE-2026-33921

MEDIUMPre-NVD 5.25.2—
EchelonGraph scoreHIGH 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%CVSS: 5.2Exploit: None knownExposed: 0

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

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
5.2(high)
EG Risk
23(Track)
EG Risk 23/100SSVC: Track

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%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
3%
KEV
Not listed

Published

August 11, 2026

Last Modified

August 11, 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 19× in last 7d / 30× 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. 2026-08-20 04:33 UTCEG score recompute
  2. 2026-08-20 04:33 UTCGHSA enrichment
  3. 2026-08-19 17:03 UTCEPSS rescore
  4. 2026-08-19 02:57 UTCEG score recompute
  5. 2026-08-19 02:57 UTCGHSA enrichment
  6. 2026-08-18 13:48 UTCEPSS rescore
  7. 2026-08-18 01:17 UTCEG score recompute
  8. 2026-08-18 01:17 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-16 23:36 UTCEG score recompute
  11. 2026-08-16 23:36 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 22:00 UTCEG score recompute
  15. 2026-08-15 22:00 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 20:23 UTCEG score recompute
  18. 2026-08-14 20:23 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 18:47 UTCGHSA enrichment
  21. 2026-08-12 17:11 UTCEG score recompute
  22. 2026-08-12 17:11 UTCGHSA enrichment
  23. 2026-08-12 13:50 UTCEPSS rescore
  24. 2026-08-11 15:35 UTCEG score recompute
  25. 2026-08-11 15:35 UTCGHSA enrichment
Show 5 more
  1. 2026-08-11 14:32 UTCEG score recompute
  2. 2026-08-11 14:32 UTCGHSA enrichment
  3. 2026-08-11 10:23 UTCEG score recompute
  4. 2026-08-11 10:02 UTCEG score recompute
  5. 2026-08-11 10:02 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

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 in the National Vulnerability Database on August 11, 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% probability of exploitation in the next 30 days, which ranks it in the top 96.7% of all scored CVEs.
What is the CVSS score of CVE-2026-33921?
CVE-2026-33921 has a CVSS v3 base score of 5.2 (NVD).
How do I remediate CVE-2026-33921?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-33921, 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.

Dependency Blast Radius

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