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Fencer Intel
high 7.9

CVE-2021-3742 json

Server-Side Request Forgery (SSRF) in chatwoot/chatwoot

published last yr. modified 4mo ago also EUVD-2021-27018

cvss
7.9
version 3.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 34%
public exploits
0
none known

Summary

A Server-Side Request Forgery (SSRF) vulnerability was discovered in chatwoot/chatwoot, affecting all versions prior to 2.5.0. The vulnerability allows an attacker to upload an SVG file containing a malicious SSRF payload. When the SVG file is used as an avatar and opened in a new tab, it can trigger the SSRF, potentially leading to host redirection.

Patch / fix

  • chatwoot chatwoot/chatwoot 2.5.0
  • chatwoot chatwoot 2.5.0

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
last yr.

Exploit prediction

0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CNA 3.0 7.9 CVSS:3.0/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
CISA ADP 3.1 7.9 CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H
NVD 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.9 CVSS:3.1/AV:A/AC:L/PR:H/UI:R/S:C/C:H/I:H/A:H

Affected products

  • chatwoot chatwoot/chatwoot
  • chatwoot chatwoot

Classification

Weakness
  • CWE-918 Server-Side Request Forgery

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.