Is CVE-2021-33842 actively exploited?

No active exploitation of CVE-2021-33842 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33842 be exploited remotely?

Partially. CVE-2021-33842 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2021-33842?

CVE-2021-33842 has a CVSS score of 8.8 (HIGH).

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HIGH

CVE-2021-33842

CWE-565Published: June 9, 2021· Updated: Jun 17, 2026

8.8

CVSS v3.1

Official Description

Improper Authentication vulnerability in the cookie parameter of Circutor SGE-PLC1000 firmware version 0.9.2b allows an attacker to perform operations as an authenticated user. In order to exploit this vulnerability, the attacker must be within the network where the device affected is located.

NVD Source

Technical Analysis

CVE-2021-33842 requires adjacent network access, limiting remote exploitation but still posing risk in shared or local network environments.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

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 8.8.