Security readout for executives and security teams
Plain-English summary
Chatwoot versions before 2.4.0 may leave a user’s older sessions alive after a password change. If someone already has a valid session token, changing the password may not remove that access. This is a moderate business risk for customer-support environments because account access can persist longer than expected.
Executive priority
Prioritize remediation where Chatwoot holds customer conversations, support workflows, or admin access. This is not evidenced as actively exploited, but persistent unauthorized sessions can undermine password resets during incident response.
Technical view
CVE-2021-3740 is a CWE-384 session fixation issue in chatwoot/chatwoot before 2.4.0. The reported flaw is failure to invalidate existing sessions on other devices after password change. Impact depends on an attacker already obtaining a valid session token; the CVSS v3.0 score is 6.8.
Likely exposure
Organizations running self-hosted Chatwoot versions earlier than 2.4.0 are the stated exposure group. The provided sources do not identify specific hosted editions, configurations, or downstream packages beyond chatwoot/chatwoot.
Exploitation context
The bundle does not show CISA KEV listing or cited evidence of active exploitation. Abuse requires prior access to a valid session token and benefits from the application failing to revoke that session after password change.
Researcher notes
Evidence is limited to the CVE description, huntr report reference, and Chatwoot commit reference. The affected range is described as prior to 2.4.0, with unspecified affected versions in the bundle. Do not assume exploit availability or additional affected products.
Mitigation direction
- Upgrade Chatwoot deployments to version 2.4.0 or later.
- Review the referenced Chatwoot fix commit and vendor guidance before rollout.
- Invalidate active sessions for affected users where administration supports it.
- Handle suspected token theft as an account compromise event.
Validation and detection
- Inventory Chatwoot instances and identify versions below 2.4.0.
- Confirm password changes terminate other active sessions using a controlled test account.
- Review authentication logs for access continuing after password resets.
- Check for unexpected devices or abnormal session persistence on privileged accounts.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-384: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCredential and access behavior lookup
The CVE wording references authentication or credential exposure, so valid-account and credential-access review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-3740 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H0.95.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
6.8MediumVector: CVSS:3.0/AV:A/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:H
Source materials
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Session Fixation
Session Fixation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.