CVE-2021-31933

Name: CVE-2021-31933
Creator: NVD / NIST
Published: 2021-04-30T21:15:09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.2/10EPSS 13.93%

Last modified Jun 17, 2026

CVE-2021-31933 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. A remote code execution vulnerability exists in Chamilo through 1.11.14 due to improper input sanitization of a parameter used for file uploads, and improper file-extension filtering for certain filenames (e.g., .phar or .pht). A remote authenticated administrator is able to upload a file containing arbitrary PHP code into specific directories via main/inc/lib/fileUpload.lib.php directory traversal to achieve PHP code execution.. EPSS estimates a 13.93% chance of exploitation in the next 30 days.

Description

A remote code execution vulnerability exists in Chamilo through 1.11.14 due to improper input sanitization of a parameter used for file uploads, and improper file-extension filtering for certain filenames (e.g., .phar or .pht). A remote authenticated administrator is able to upload a file containing arbitrary PHP code into specific directories via main/inc/lib/fileUpload.lib.php directory traversal to achieve PHP code execution.

Metrics

CVSS 3.1

7.2/10

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

13.93%

96.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-706

Affected Software

Vendor	Product	Versions
Chamilo	Chamilo	<= 1.11.14

References

http://packetstormsecurity.com/files/162572/Chamilo-LMS-1.11.14-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/chamilo/chamilo-lms/commit/229302139e8d23bf6862183cf219b967f6e2fbc1Patch, Third Party Advisory
https://github.com/chamilo/chamilo-lms/commit/f65d065061a77bb2e84f73217079ce3998cf3453Patch, Third Party Advisory
https://support.chamilo.org/projects/1/wiki/Security_issues#Issue-48-2021-04-17-Critical-impact-high-risk-Remote-Code-ExecutionPatch, Vendor Advisory
http://packetstormsecurity.com/files/162572/Chamilo-LMS-1.11.14-Remote-Code-Execution.htmlExploit, Third Party Advisory, VDB Entry
https://github.com/chamilo/chamilo-lms/commit/229302139e8d23bf6862183cf219b967f6e2fbc1Patch, Third Party Advisory
https://github.com/chamilo/chamilo-lms/commit/f65d065061a77bb2e84f73217079ce3998cf3453Patch, Third Party Advisory
https://support.chamilo.org/projects/1/wiki/Security_issues#Issue-48-2021-04-17-Critical-impact-high-risk-Remote-Code-ExecutionPatch, Vendor Advisory

Timeline

Published: Apr 30, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-31933?

How severe is CVE-2021-31933?

CVE-2021-31933 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 13.93% probability of exploitation in the next 30 days.

How do I fix CVE-2021-31933?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-31933?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST