How severe is CVE-2021-3742?

CVE-2021-3742 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-3742 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-3742?

CVE-2021-3742 affects Chatwoot. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-3742?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2021-3742 have an EU (EUVD) identifier?

Yes. CVE-2021-3742 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-27018.

When was CVE-2021-3742 published?

CVE-2021-3742 was published on 2024-11-15 and last updated on 2026-06-17.

CVE-2021-3742

CVE-2021-3742 is a high-severity vulnerability in Chatwoot with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: High (CVSS 3.x base score 8.8)
EPSS exploit prediction: 0% (29th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2021-27018
Weakness: CWE-918
Affected product: Chatwoot
Published: 2024-11-15
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2021-3742?: 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.
How severe is CVE-2021-3742?: CVE-2021-3742 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-3742 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (29th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-3742?: CVE-2021-3742 affects Chatwoot. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-3742?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2021-3742 have an EU (EUVD) identifier?: Yes. CVE-2021-3742 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2021-27018.
When was CVE-2021-3742 published?: CVE-2021-3742 was published on 2024-11-15 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:chatwoot:chatwoot:*:*:*:*:*:*:*:*

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CVE-2021-3813 — Medium (CVSS 6.5): Improper Privilege Management in GitHub repository chatwoot/chatwoot prior to v2.2.

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