CVE-2020-13671
HighExploitedPublic exploitDrupal core Unrestricted Upload of File with Dangerous Type
Published Oct 12, 2021 · Updated Sep 19, 2026 · Also known as BIT-drupal-2020-13671, DRUPAL-CORE-2020-012, GHSA-68jc-v27h-vhmw, UBUNTU-CVE-2020-13671
Key Facts
Patch immediately- CVE-2020-13671 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Drupal, Fedora (Fedoraproject), drupal7 (alpine) and 3 more products.
- It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 12, 2021 and is known to be used in ransomware campaigns. Public exploit code is available.
- EPSS estimates a 36% probability of exploitation in the next 30 days.
- Fixed versions are available, including Drupal 7.74.0, Drupal 8.8.11, Drupal 8.9.9.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
36%
Higher than 98.4% of all scored CVEs
Exploited in the wild
Yes
4 catalog listings, used by ransomware
Public exploit code
Available
Proof-of-concept or weaponized module
Get the full CVE-2020-13671 brief as a PDF
Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.
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.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| CISA KEV | Jan 18, 2022 | Jul 18, 2022 | Not reported |
| Industry KEV feed | Apr 12, 2021 | Jul 18, 2022 | Known |
| CIRCL KEV | Jan 18, 2022 | Jul 18, 2022 | Not reported |
| ENISA EUVD | Jan 18, 2022 | n/a | Not reported |
Required action: Apply updates per vendor instructions.
Affected Products
20 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| DrupalDrupal | >= 7.0.0 | 7.74 |
| FedoraFedoraproject | 32, 33 | n/a |
| drupal7alpine | See advisory | 7.74-r0 |
| drupal/corecomposer | >= 7.0.0 | 7.74 |
| drupal/drupalcomposer | >= 9.0.0 | 9.0.8 |
Patched Releases
Drupal
7.74.0, 8.8.11, 8.9.9, 9.0.8, 7.74
drupal/core
7.74, 8.8.11, 8.9.9, 9.0.8
drupal/drupal
7.74, 8.8.11, 8.9.9, 9.0.8
drupal7
7.26-1ubuntu0.1+esm2, 7.44-1ubuntu1~16.04.0+esm2, 7.52-2+deb9u12, 7.74-r0
Timeline
Added to Industry KEV feed
Apr 12, 2021
Publicly disclosed
Oct 12, 2021
Added to CISA KEV
Jan 18, 2022
Added to CIRCL KEV
Jan 18, 2022
Added to ENISA EUVD
Jan 18, 2022
Last updated
Sep 19, 2026
Weakness Type
- CWE-434 Unrestricted Upload of File with Dangerous Type
References
- advisoryhttps://exchange.xforce.ibmcloud.com/vulnerabilities/190097X-Force
- advisoryhttps://exchange.xforce.ibmcloud.com/vulnerabilities/190114
- advisoryhttps://exchange.xforce.ibmcloud.com/vulnerabilities/190115X-Force
- advisoryhttps://exchange.xforce.ibmcloud.com/vulnerabilities/190116X-Force
- advisoryGHSA advisory
FAQ
Common Questions.
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.
Affected: Drupal versions >= 7.0.0; Fedora (Fedoraproject) versions 32, 33; drupal7 (alpine), among others. The full list is in the CVE brief.
It is exploited in the wild, listed in CISA KEV, Industry KEV feed, CIRCL KEV, ENISA EUVD since Apr 12, 2021 and is known to be used in ransomware campaigns.
Yes. It was added on Jan 18, 2022 with a federal remediation due date of Jul 18, 2022.
Public exploit code is available.
Fixed versions are available, including Drupal 7.74.0, Drupal 8.8.11, Drupal 8.9.9.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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