Is CVE-2021-40867 actively exploited?

No active exploitation of CVE-2021-40867 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-40867 be exploited remotely?

Partially. CVE-2021-40867 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2021-40867?

CVE-2021-40867 has a CVSS score of 7.1 (HIGH).

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HIGH

CVE-2021-40867

CWE-290Published: September 13, 2021· Updated: Jun 17, 2026

7.1

CVSS v3.1

Official Description

Certain NETGEAR smart switches are affected by an authentication hijacking race-condition vulnerability by an unauthenticated attacker who uses the same source IP address as an admin in the process of logging in (e.g., behind the same NAT device, or already in possession of a foothold on an admin's machine). This occurs because the multi-step HTTP authentication process is effectively tied only to the source IP address. This affects GC108P before 1.0.8.2, GC108PP before 1.0.8.2, GS108Tv3 before 7.0.7.2, GS110TPP before 7.0.7.2, GS110TPv3 before 7.0.7.2, GS110TUP before 1.0.5.3, GS308T before 1.0.3.2, GS310TP before 1.0.3.2, GS710TUP before 1.0.5.3, GS716TP before 1.0.4.2, GS716TPP before 1.0.4.2, GS724TPP before 2.0.6.3, GS724TPv2 before 2.0.6.3, GS728TPPv2 before 6.0.8.2, GS728TPv2 before 6.0.8.2, GS750E before 1.0.1.10, GS752TPP before 6.0.8.2, GS752TPv2 before 6.0.8.2, MS510TXM before 1.0.4.2, and MS510TXUP before 1.0.4.2.

NVD Source

Technical Analysis

CVE-2021-40867 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.1.