{"id":"CVE-2017-6920","url":"https://www.cyber-defence.io/tools/cve/CVE-2017-6920","generatedAt":"2026-10-28T20:48:13.174Z","title":"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.","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.","published":"2018-08-06T15:29:00.000Z","lastModified":"2026-06-17T01:23:20.000Z","status":"Modified","sourceIdentifier":"mlhess@drupal.org","cvss":{"version":"3.0","score":9.8,"severity":"CRITICAL","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},"cwe":["CWE-19"],"affected":["drupal/drupal"],"epss":{"score":0.20239,"percentile":0.97453,"date":"2026-10-27","history":[{"date":"2026-09-21","score":0.15557,"percentile":0.96731},{"date":"2026-09-22","score":0.20482,"percentile":0.97392}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 20.2%, higher than 97% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"http://www.securityfocus.com/bid/99211","tags":["Third Party Advisory","VDB Entry"],"source":"mlhess@drupal.org"},{"url":"http://www.securitytracker.com/id/1038781","tags":["Third Party Advisory","VDB Entry"],"source":"mlhess@drupal.org"},{"url":"https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple","tags":["Patch","Vendor Advisory"],"source":"mlhess@drupal.org"},{"url":"http://www.securityfocus.com/bid/99211","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"http://www.securitytracker.com/id/1038781","tags":["Third Party Advisory","VDB Entry"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple","tags":["Patch","Vendor Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2017-6920","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}