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.

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Advisories

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Fixes

Solution

Upgrade Arc to v2.7.0 or later.


Workaround

Reinstall Npcap on the affected host with the "Restrict Npcap driver's access to Administrators only" option enabled.

History

Tue, 11 Aug 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 11 Aug 2026 10:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Npcap driver installed without administrator-only access restriction on Windows in Arc before v2.7.0
First Time appeared Nozomi Networks
Nozomi Networks arc
Weaknesses CWE-1188
CPEs cpe:2.3:a:nozomi_networks:arc:*:*:*:*:*:windows:*:*
Vendors & Products Nozomi Networks
Nozomi Networks arc
References
Metrics cvssV3_1

{'score': 5.2, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'}

cvssV4_0

{'score': 4.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Nozomi

Published:

Updated: 2026-08-11T14:15:15.632Z

Reserved: 2026-03-24T16:06:11.950Z

Link: CVE-2026-33921

cve-icon Vulnrichment

Updated: 2026-08-11T14:15:12.262Z

cve-icon NVD

Status : Received

Published: 2026-08-11T10:17:11.963

Modified: 2026-08-11T15:17:29.110

Link: CVE-2026-33921

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-11T12:30:09Z

Weaknesses