CVE-2026-33921
mediumpriority · track · 0OT risk · elevatedEPSS 0.001 · 3 %ileEUUSEPSS · scored 2026-10-27
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.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedArcnozomi_psirt
Upgrade Arc to v2.7.0 or later.
- MitigationArcnozomi_psirt
Reinstall Npcap on the affected host with the "Restrict Npcap driver's access to Administrators only" option enabled.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · low–medium · 1.1–5.2
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (3)
Products and version ranges known to be affected.
advisories (1)
Vendor and ecosystem advisories describing this.
- NN-2026:14-01Npcap driver installed without administrator-only access restriction on Windows in Arc before v2.7.02026-08-11csaf · nozomi_psirtUS
also known as (3)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (4)
External citations — patches, advisories, analysis.
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