Arbitrary file upload in Drupal
CVE-2020-13671
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…
Vulnerability class: Unrestricted File Upload
EPSS: 0.043 (90.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Drupal
- Drupal Core — versions 9.0 versions prior to 9.0.8, 8.9 versions prior to 8.9.9, 8.8 versions prior to 8.8.11
- Fedoraproject Fedora — versions 32, 33
Weakness classification (CWE)
CISA KEV (Known Exploited Vulnerabilities)
This CVE is on the CISA KEV catalog, added on . CISA KEV inclusion means CISA has confirmed in-the-wild exploitation; US federal agencies are required to remediate within a published due date.
BOD 22-01 due date: .
Required action: Apply updates per vendor instructions.
Public proof-of-concept exploits
References
- mlhess@drupal.org (x_refsource_CONFIRM, Vendor Advisory)
- mlhess@drupal.org (x_refsource_FEDORA, vendor-advisory, Mailing List, Release Notes)
- mlhess@drupal.org (x_refsource_FEDORA, vendor-advisory, Mailing List, Release Notes)
- 134c704f-9b21-4f2e-91b3-4a467353bcc0 (US Government Resource)
Frequently asked questions
- What is CVE-2020-13671?
- CVE-2020-13671 is a high-severity vulnerability in Drupal, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2020-11-20.
- How severe is CVE-2020-13671?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2020-13671 known to be exploited?
- Yes. CVE-2020-13671 is listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-01-18), indicating it is being actively exploited. 4 public proof-of-concept repositories are indexed.