CVE-2014-7847: Denial of Service Vulnerability in Moodle

moodle/moodle Updated 02 Oct 2025

Summary

13/05/2022

Disclosed on

CVE-2014-7847

CVE

Yes i

Fix available

Moderate

Severity

Not published

CVSS Score

CVE-2014-7847: Moodle allows attackers to cause a denial of service. Affects moodle/moodle across 3 version ranges.

< 2.5.9 >= 2.6.0, < 2.6.6 >= 2.7.0, < 2.7.3

Fixed in 2.5.9, 2.6.6 or 2.7.3, depending on the release line you run. How to fix ↓

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Background

Moodle is an open-source learning management system (LMS) used for creating and delivering online courses. It provides a platform for educators to create interactive and engaging learning experiences for students. Moodle is widely adopted by educational institutions and organizations around the world. However, a vulnerability has been identified in Moodle versions 2.4.11 to 2.7.3 that allows remote attackers to cause a denial of service (DoS) by triggering the calculation of an estimated latitude and longitude for an IP address.

Vulnerability Detail

The vulnerability exists in the 'iplookup/index.php' file of Moodle. By exploiting this vulnerability, an attacker can cause resource consumption, leading to a DoS condition. This is achieved by triggering the calculation of an estimated latitude and longitude for a specific IP address. The excessive resource usage caused by this calculation can overwhelm the system, resulting in degraded performance or complete unavailability of the Moodle instance.

How To Fix

Fixed versions by release line

The minimum fixed version depends on the release line you run.

< 2.5.9 2.5.9
```
composer require moodle/moodle:2.5.9
```
>= 2.6.0, < 2.6.6 2.6.6
```
composer require moodle/moodle:2.6.6
```
>= 2.7.0, < 2.7.3 2.7.3
```
composer require moodle/moodle:2.7.3
```

Tip — Not sure which release line you're on? Vulert can find the fix for the version you are using. Scan free →

Workaround

There is no specific workaround provided for this vulnerability. The recommended approach is to apply the available patches or update to the fixed versions of Moodle.

Conclusion

The identified vulnerability in Moodle versions 2.4.11 to 2.7.3 can be exploited by remote attackers to cause a denial of service. To mitigate this issue, it is crucial to update Moodle to the recommended versions or apply the available patches. For further assistance or support in vulnerability remediation, please reach out to DevNack.com.

See every vulnerability recorded for moodle/moodle →