CVE-2017-6920
Drupal PECL YAML parser unsafe object handling
9.8
CRITICAL
CVSS 3.1
EPSS 66.1%
Description
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.
How to fix CVE-2017-6920
To remediate CVE-2017-6920, upgrade the affected package to a fixed version below.
- Packagist/drupal/core—upgrade to 8.3.4 or later
- —upgrade to 8.3.4 or later
Is CVE-2017-6920 being exploited?
Likely — EPSS is 66.1%, placing CVE-2017-6920 in the top tier of vulnerabilities by exploitation probability. Prioritise patching.
Affected packages (2)
- >= 8.0, < 8.3.4
- >= 8.0, < 8.3.4
CVSS scores
| Source | Version | Severity | Vector |
|---|---|---|---|
| osv | CVSS 3.1 | CRITICAL9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |