Security readout for executives and security teams
Plain-English summary
Chatwoot versions before 2.5.0 could let a highly privileged attacker abuse an SVG avatar to make the server request attacker-chosen resources when that avatar is opened. This is not listed as known exploited, but the potential impact is high because SSRF can affect internal systems or sensitive services.
Executive priority
Treat this as a high-priority patching item for Chatwoot, especially where the service can access internal systems. The privilege and interaction requirements reduce urgency versus unauthenticated remote bugs, but SSRF impact can be material in connected environments.
Technical view
CVE-2021-3742 is an SSRF flaw in chatwoot/chatwoot before 2.5.0. The reported path involves uploading an SVG containing SSRF behavior, setting it as an avatar, and requiring user interaction by opening it in a new tab. CVSS 3.0 is 7.9 with high confidentiality, integrity, and availability impact.
Likely exposure
Organizations running chatwoot/chatwoot before 2.5.0 are the relevant exposure group. Risk is higher where privileged users can upload avatar images and where the Chatwoot server can reach internal networks, metadata services, or sensitive downstream systems.
Exploitation context
The CVE record does not indicate CISA KEV listing or active exploitation. The attack requires high privileges and user interaction, but low complexity once those conditions exist. Evidence provided supports SSRF via SVG avatar handling, with potential host redirection.
Researcher notes
Do not assume broader product impact beyond chatwoot/chatwoot from the supplied evidence. The public description identifies versions before 2.5.0 and references a GitHub fix commit, but detailed environmental prerequisites and complete exploit telemetry are not provided here.
Mitigation direction
- Upgrade affected Chatwoot deployments to version 2.5.0 or later.
- Review Chatwoot vendor guidance and the referenced fixing commit before choosing compensating controls.
- Prioritize internet-facing or network-connected Chatwoot instances for remediation.
- Restrict avatar upload workflows to trusted administrators until patched, where operationally feasible.
Validation and detection
- Inventory all Chatwoot deployments and record their running versions.
- Flag any chatwoot/chatwoot version earlier than 2.5.0 as affected.
- Confirm whether avatar upload workflows accept SVG files in affected environments.
- Review logs for unusual SVG avatar uploads or suspicious server-side redirection activity.
- After upgrading, verify the deployment reports version 2.5.0 or later.
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-918: Information exposure and cloud metadata lookup
Information exposure and SSRF weaknesses can make discovery, cloud metadata, and credential material review relevant. 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 lookupCloud metadata behavior lookup
The CVE wording references SSRF or metadata access, so cloud discovery and credential material review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-3742 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
- High
- CVSS
- 7.9 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:A/AC:L/PR:H/UI:R/S:C/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:L/PR:H/UI:R/S:C/C:H/I:H/A:H1.26Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
7.9HighVector: CVSS:3.0/AV:A/AC:L/PR:H/UI:R/S:C/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.
Server-Side Request Forgery (SSRF)
Server-Side Request Forgery (SSRF) represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.