CVE-2017-6920 in the critical feed json
Drupal PECL YAML parser unsafe object handling
published 2018-08-06 8 y ago modified 2026-06-17 4 mo ago also GHSA-9c24-g32g-35rj , EUVD-2022-3347
- cvss
- 9.8
- version 3.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 20.2%
- EPSS 20.2% chance of exploitation in 30 days, percentile 97%
- public exploits
- 0
- none known
Summary
Drupal core 8 before versions 8.3.4 allows remote attackers to execute arbitrary code due to the PECL YAML parser not handling PHP objects safely during certain operations.
Patch / fix
- packagist drupal/core 8.3.4
- packagist drupal/drupal 8.3.4
- drupal drupal 8.3.4
Exploit prediction
20.24% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVD | 2.0 | 7.5 | AV:N/AC:L/Au:N/C:P/I:P/A:P |
| GitHub | 3.0 | 9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | drupal/core | >=8.0, <8.3.4 |
8.3.4 |
| packagist | drupal/drupal | >=8.0, <8.3.4 |
8.3.4 |
Affected products
- Drupal.org Drupal Core
Classification
References
-
drupal.org
/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple
web, patch, vendor-advisory
-
securityfocus.com
/bid/99211
vdb-entry, web, third-party-advisory
-
securitytracker.com
/id/1038781
vdb-entry, web, third-party-advisory
-
nvd.nist.gov
/vuln/detail/CVE-2017-6920
advisory
-
github.com
/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6920.yaml
web
-
github.com
/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6920.yaml
web
-
github.com
/drupal/core
package
-
drupal.org
/SA-CORE-2017-003
web
Sources
- CVE List CVE-2017-6920
- GitHub Advisory GHSA-9c24-g32g-35rj
- NVD CVE-2017-6920
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.