Vulnerability · Published Aug 11, 2026 · Assigned by Nozomi
CVE-2026-33921Npcap driver installed without administrator-only access restriction on Windows in Arc before v2.7.0
Medium 5.2
In plain English
A medium-severity security flaw in Arc from Nozomi Networks. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 3% of all known vulnerabilities).
Official 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 (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Nozomi Networks | Arc | 0 – before 2.7.0 |
Weakness: CWE-1188 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N