CVE-2020-13671
Drupal core Un-restricted Upload of File
- High 8.8
- Exploited: added to CISA KEV 18 Jan 2022
Description
Drupal core does not properly sanitize certain filenames on uploaded files, which can lead to files being interpreted as the incorrect extension and served as the wrong MIME type or executed as PHP for certain hosting configurations. This issue affects: Drupal Drupal Core 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11, and 7 versions prior to 7.74.
Key facts
- Published
- 20 Nov 2020
- Last changed
- 21 Oct 2025
- Assigned by
- drupal
- KEV added
- 18 Jan 2022
- KEV fix due
- 18 Jul 2022
- EPSS
- 32.568% likely to be exploited in the next 30 days, higher than 98.365% of CVEs (scores for 15 Nov 2026)
- SSVC (CISA)
- Exploitation: active; Automatable: no; Technical impact: total
Severity scores
Each score is shown as its source gave it. They are not averaged or merged.
- 8.8CVSS 3.1, Highfrom CISA (ADP container)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
What to do
- Apply updates per vendor instructions.CISA KEV required action
Historical context and remediation
This reference retains the original CVE publication date. A recent record update does not mean a new attack occurred.
No separately sourced impact summary is available on this page yet. Consult the description, version data and dated exploitation evidence.
Version statuses below come from the CNA. An “unaffected” version is not necessarily a currently supported release or proof of a patch date. EPSS is a dated risk estimate, not a count of historical attacks.
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Drupal | Drupal Core |
|
Timeline
- 20 Nov 2020 Published
- 18 Jan 2022 CVE-2020-13671 added to CISA KEV
- 18 Jan 2022 Added to the CISA KEV catalogue