Back
CVE-2017-6920
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…
Critical9.8EPSS 20.2%
- Published
- Updated
- Reserved
- Assigned by
- drupal
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.
Timeline
ID reserved
By drupal
- 17 months later
· 17 months later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.0 | Critical9.8 | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 20.2% · top 2.5% of all CVEs (8 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
- Remote Code Execution
- CWE-19 (opens in a new tab)All about CWE-19 and its CVEs
Affected products
- affected 8 prior to 8.3.4
Affected packages
From reviewed advisories of the GitHub Advisory Database.
- Packagistdrupal/coreGHSA-9c24-g32g-35rj (opens in a new tab)
- Packagistdrupal/drupalGHSA-9c24-g32g-35rj (opens in a new tab)
References (3)
- https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple (opens in a new tab)x_refsource_CONFIRMx_transferred
- 99211 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- 1038781 (opens in a new tab)vdb-entryx_refsource_SECTRACKx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisory GHSA-9c24-g32g-35rj (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2017-6920)Record last updated .