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CVE-2011-4203

5.0 · MEDIUM

CRLF injection vulnerability in calendar/set.php in the Calendar component in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, 2.1.x before 2.1.3, and 2.2 allows remote attackers to inject arbitrary…

Published Dec 22, 2011moodleCWE-94EPSS 1.18%

Overview

CVE-2011-4203 is a medium-severity vulnerability affecting moodle moodle. It was published on December 22, 2011 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

CRLF injection vulnerability in calendar/set.php in the Calendar component in Moodle 1.9.x before 1.9.15, 2.0.x before 2.0.6, 2.1.x before 2.1.3, and 2.2 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via vectors involving the url variable.

Remediation

Check the references section for vendor advisories and patches from moodle. Update moodle to the latest patched version. 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.

Affected products

VendorProductVersionsStatus

References

Refpenturalabs.wordpress.com/2011/12/13/advisory-crlf-injection-vulnerability-in-moodle/Reftracker.moodle.org/browse/MDL-24808Refpenturalabs.wordpress.com/2011/12/13/advisory-crlf-injection-vulnerability-in-moodle/Reftracker.moodle.org/browse/MDL-24808

How CyberStrike helps

Frequently asked questions

What is CVE-2011-4203?

CVE-2011-4203 is a medium-severity vulnerability affecting moodle moodle. It was published on December 22, 2011 and has a CVSS 2.0 base score of 5.0 (MEDIUM).

How severe is CVE-2011-4203?

This vulnerability has a CVSS 2.0 base score of 5.0, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2011-4203?

Check the references section for vendor advisories and patches from moodle. Update moodle to the latest patched version. 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-2011-4203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2011-4203 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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