How severe is CVE-2020-13671?

CVE-2020-13671 has a CVSS 3.1 base score of 8.8 (HIGH). EPSS estimates a 35.4% probability of exploitation in the next 30 days. It is listed in the CISA Known Exploited Vulnerabilities catalog.

CVE-2020-13671: Drupal core Un-restricted Upload of File

CISA Known Exploited Vulnerabilities

Drupal core Un-restricted Upload of File is confirmed as actively exploited and is listed in the CISA KEV catalog.

Added to KEV

2022-01-18

Remediation due

2022-07-18

Required action
Apply updates per vendor instructions.

CISA notes
https://nvd.nist.gov/vuln/detail/CVE-2020-13671

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.

Severity

CVSS 3.1 · CISA8.8 HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC · CISA-ADP

Exploitationactive

Automatableno

Technical impacttotal

Exploitation Context

as of October 14, 2026

All KEV statistics→

CISA added CVE-2020-13671 to the KEV catalog 424 days after its CVE record was published.
It is one of 5 Drupal entries in the CISA KEV catalog, and one of 3 added in 2022.
Its current EPSS score (35.4%) is higher than that of 44% of CISA KEV entries.

Affected Products

Vendor	Product	Affected versions
Drupal	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 7 versions prior to 7.74

References

3 Links

Vendor advisories

Other references

https://www.drupal.org/sa-core-2020-012

Record Details

Published

2020-11-20

Last updated

2025-10-21

Assigner (CNA)

drupal

Credited to

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CVE record data © The MITRE Corporation, used under the CVE Terms of Use. Exploited-in-the-wild data from the CISA Known Exploited Vulnerabilities catalog (CC0). Exploit prediction scores by FIRST EPSS (first.org/epss). This site is not endorsed or certified by MITRE, NVD, CISA, or FIRST.