CVE-2021-31933Public exploitNetwork attack vector

Administrator code execution via unrestricted upload paths

Published Apr 30, 2021 · Updated Aug 3, 2024

Remote code execution in Chamilo LMS 1.11.14 and earlier allows remote authenticated administrators to execute PHP via file upload. The handle_uploaded_document path accepts an upload destination outside the course document root, while php2phps fails to neutralize .phar names, allowing PHP content to reach executable web directories. Administrator access is required, and successful exploitation runs arbitrary PHP with the web server's privileges, enabling data access, modification, and service interruption.

CVSS severity7.2
High
EPSS probability13.93%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Remote code execution in Chamilo LMS 1.11.14 and earlier allows remote authenticated administrators to execute PHP via file upload. The handle_uploaded_document path accepts an upload destination outside the course document root, while php2phps fails to neutralize .phar names, allowing PHP content to reach executable web directories. Administrator access is required, and successful exploitation runs arbitrary PHP with the web server's privileges, enabling data access, modification, and service interruption.

The record

CVE
CVE-2021-31933
Published
Apr 30, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-706, T1505.003
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 30, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2MITRECVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
6.5NVDAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-706Use of Incorrectly-Resolved Name or Reference
T1505.003Server Software Component: Web Shell

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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