CVE-2017-6921

Name: CVE-2017-6921
Creator: NVD / NIST
Published: 2019-01-15T21:29:00.243+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 1.83%

Last modified Jun 17, 2026

CVE-2017-6921 is a vulnerability of currently unknown severity. In Drupal 8 prior to 8.3.4; The file REST resource does not properly validate some fields when manipulating files. A site is only affected by this if the site has the RESTful Web Services (rest) module enabled, the file REST resource is enabled and allows PATCH requests, and an attacker can get or register a user account on the site with permissions to upload files and to modify the file resource.. EPSS estimates a 1.83% chance of exploitation in the next 30 days.

Description

In Drupal 8 prior to 8.3.4; The file REST resource does not properly validate some fields when manipulating files. A site is only affected by this if the site has the RESTful Web Services (rest) module enabled, the file REST resource is enabled and allows PATCH requests, and an attacker can get or register a user account on the site with permissions to upload files and to modify the file resource.

Metrics

EPSS Probability

1.83%

76.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Drupal	Drupal	>= 8.0.0, < 8.3.4

References

http://www.securityfocus.com/bid/99222Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038781Third Party Advisory, VDB Entry
https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multipleMitigation, Vendor Advisory
http://www.securityfocus.com/bid/99222Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1038781Third Party Advisory, VDB Entry
https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multipleMitigation, Vendor Advisory

Timeline

Published: Jan 15, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-6921?

How severe is CVE-2017-6921?

Severity scoring for CVE-2017-6921 is pending analysis. The EPSS model estimates a 1.83% probability of exploitation in the next 30 days.

How do I fix CVE-2017-6921?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2017-6921?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST