Moderate severityNVD Advisory· Published Dec 22, 2011· Updated Jun 16, 2026
CVE-2011-4203
CVE-2011-4203
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
moodle/moodlePackagist | < 1.9.15 | 1.9.15 |
moodle/moodlePackagist | >= 2.0, < 2.0.6 | 2.0.6 |
moodle/moodlePackagist | >= 2.1, < 2.1.3 | 2.1.3 |
Affected products
25cpe:2.3:a:moodle:moodle:1.9.1:*:*:*:*:*:*:*+ 23 more
- cpe:2.3:a:moodle:moodle:1.9.1:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.10:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.11:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.12:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.13:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.14:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.2:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.3:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.4:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.5:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.6:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.7:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.8:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:1.9.9:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.0.0:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.0.1:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.0.2:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.0.3:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.0.4:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.0.5:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.1.1:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.1.2:*:*:*:*:*:*:*
- cpe:2.3:a:moodle:moodle:2.2.0:*:*:*:*:*:*:*
Patches
Vulnerability mechanics
References
10- penturalabs.wordpress.com/2011/12/13/advisory-crlf-injection-vulnerability-in-moodle/nvdExploit
- github.com/advisories/GHSA-4w8m-96v9-2c86ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2011-4203ghsaADVISORY
- penturalabs.wordpress.com/2011/12/13/advisory-crlf-injection-vulnerability-in-moodleghsaWEB
- github.com/moodle/moodle/commit/581e8dba387f090d89382115fd850d8b44351526ghsaWEB
- github.com/moodle/moodle/commit/ae7cc577b7115a7ad7a68dc4986aca9e2bda2cf5ghsaWEB
- github.com/moodle/moodle/commit/bc577df6a974606fcb0882b090b00ea5a4e10cf6ghsaWEB
- github.com/moodle/moodle/commit/e311b14364719b0f7851149ee51c1a4ec732635eghsaWEB
- moodle.org/mod/forum/discuss.phpghsaWEB
- tracker.moodle.org/browse/MDL-24808nvd
News mentions
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