CVE-2017-6920

highpriority · attend · 46EPSS 0.202 · 97 %ileEUUS

grimoire priorityP1 · Urgent

Exploitable?

—

no known exploitation

Likely / severe?

20.2% (97th) EPSS

CVSS 7.5 · high

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · osv

EPSS · scored 2026-10-27

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.

cvss

Technical severity, 0–10. One row per scoring source.

9.8

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.09.8criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · OSV

v3.09criticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-19USprimaryCWE-94US

affected products (4)

Products and version ranges known to be affected.

Drupal.org drupal core≤ 8 prior to 8.3.4enisa_euvdEU
drupal drupal8.0.0 → 8.3.4nvdUScpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
Packagist drupal/core8.0 → 8.3.4osvUSpkg:composer/drupal/core
Packagist drupal/drupal8.0 → 8.3.4osvUSpkg:composer/drupal/drupal

advisories (1)

Vendor and ecosystem advisories describing this.

GHSA-9c24-g32g-35rjDrupal PECL YAML parser unsafe object handling2022-05-14ghsa · osvUS
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.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd osv NVD CVE.org MITRE

published 2018-08-06modified 2026-06-17

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+362 more

references (8)

External citations — patches, advisories, analysis.

scry

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