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CVE-2021-40109

6.4 · MEDIUM

A SSRF issue was discovered in Concrete CMS through 8.5.5.

Published Sep 27, 2021CWE-918EPSS 0.54%

Overview

CVE-2021-40109 is a medium-severity vulnerability. It was published on September 27, 2021 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

A SSRF issue was discovered in Concrete CMS through 8.5.5. Users can access forbidden files on their local network. A user with permissions to upload files from external sites can upload a URL that redirects to an internal resource of any file type. The redirect is followed and loads the contents of the file from the redirected-to server. Files of disallowed types can be uploaded.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocumentation.concretecms.org/developers/introduction/version-history/856-release-notesRefhackerone.com/reports/1102105Refdocumentation.concretecms.org/developers/introduction/version-history/856-release-notesRefhackerone.com/reports/1102105

How CyberStrike helps

Frequently asked questions

What is CVE-2021-40109?

CVE-2021-40109 is a medium-severity vulnerability. It was published on September 27, 2021 and has a CVSS 3.1 base score of 6.4 (MEDIUM).

How severe is CVE-2021-40109?

This vulnerability has a CVSS 3.1 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-40109?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-40109?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-40109 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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