What’s Vulnerable › Vulnerabilities
CVE-2026-33921: Npcap driver installed without administrator-only access restriction on Windows in Arc before v2.7.0
- Severity: medium (CVSS 5.2 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-08-11 · updated 2026-10-23
- Weakness: CWE-1188
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.
Affected products
- Nozomi Networks Arc: before 2.7.0 — fixed in 2.7.0
How to fix
Upgrade to a fixed version: Nozomi Networks Arc 2.7.0. Check the vendor advisory for mitigations.
References
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