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CVE-2021-21809 is a command execution vulnerability in the default legacy spellchecker plugin in Moodle 3.10. According to the provided content, a specially crafted series of HTTP requests can trigger command execution through this plugin. The vulnerable component is the legacy spellchecker functionality shipped by default in affected Moodle deployments. The available information does not identify the exact vulnerable function or code path beyond the legacy spellchecker plugin itself.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository contains a single Metasploit module (modules/exploits/multi/http/moodle_spelling_path_rce.rb) that exploits an authenticated remote command execution vulnerability in Moodle (CVE-2021-21809). The exploit targets the aspell path configuration in the Moodle admin interface, allowing an attacker with administrator credentials to inject a PHP command that is later triggered via the spellchecker functionality. The module is weaponized, supporting customizable PHP payloads (defaulting to Meterpreter reverse shell) and includes cleanup routines to revert changes after exploitation. The attack is performed over HTTP(S) and requires valid admin credentials. The code is well-structured, leveraging Metasploit's HTTP client and Moodle helper modules, and is suitable for operational use against vulnerable Moodle installations.
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