CVE-2026-33921 — MEDIUM (5.2)

Vulnerability 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.

CVSS Score

5.2

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

CHANGED

Confidentiality

LOW

Integrity

LOW

Availability

NONE

Related Weaknesses (CWE)

CWE-1188

References

https://security.nozominetworks.com/NN-2026:14-01

FAQ

What is CVE-2026-33921?

CVE-2026-33921 is a vulnerability with a CVSS score of 5.2 (MEDIUM). 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 ad...

How severe is CVE-2026-33921?

CVE-2026-33921 has been rated MEDIUM with a CVSS base score of 5.2/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-33921?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.