CVE-2021-21809
A command execution vulnerability exists in the default legacy spellchecker plugin in Moodle 3.10.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 24.2%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.
Description
A command execution vulnerability exists in the default legacy spellchecker plugin in Moodle 3.10. A specially crafted series of HTTP requests can lead to command execution. An attacker must have administrator privileges to exploit this vulnerabilities.
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 24.17% probability · 98th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-78
- Affected
- moodle/moodle
- Source
- talos-cna@cisco.com
EPSS 24.2% since 26 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-Authenticated-Remote-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277Exploit, Third Party Advisory
- http://packetstormsecurity.com/files/164481/Moodle-SpellChecker-Path-Authenticated-Remote-Command-Execution.htmlExploit, Third Party Advisory, VDB Entry
- https://talosintelligence.com/vulnerability_reports/TALOS-2021-1277Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.