Is CVE-2021-3740 actively exploited?

No active exploitation of CVE-2021-3740 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-3740 be exploited remotely?

Partially. CVE-2021-3740 requires adjacent network access (same network segment) to exploit.

What is the CVSS score of CVE-2021-3740?

CVE-2021-3740 has a CVSS score of 6.8 (MEDIUM).

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MEDIUM

CVE-2021-3740

CWE-384Published: November 15, 2024· Updated: Jun 17, 2026

6.8

CVSS v3.1

Official Description

A Session Fixation vulnerability exists in chatwoot/chatwoot versions prior to 2.4.0. The application does not invalidate existing sessions on other devices when a user changes their password, allowing old sessions to persist. This can lead to unauthorized access if an attacker has obtained a session token.

NVD Source

Technical Analysis

CVE-2021-3740 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 6.8.