🛡️ CVE-2017-6920 — core

🔴 CVSS 9.5 — Critical ✅ No Known Exploit CWE-94 OSV
9.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Drupal PECL YAML parser unsafe object handling

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 this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs no privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

CVE-2017-6920 is classified as CWE-94: Code Injection. Input is incorporated into code that the runtime evaluates, so an attacker can have their own code executed.

Affected software

CVE-2017-6920 is recorded against 2 packages.

  • drupal/core (from 8.0 up to 8.3.4)
  • drupal/drupal (from 8.0 up to 8.3.4)

Timeline and source

Published on 14 May 2022 and last revised on 23 April 2024. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Advisory)
github.com (Web)
github.com (Web)
github.com (Package)
www.drupal.org (Web)
www.drupal.org (Web)
www.securityfocus.com (Web)
www.securitytracker.com (Web)

Details

Severity CRITICAL
CVSS Score 9.5
CVSS Vector CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE CWE-94
Public Exploit ✅ No
Source OSV
Published 2022-05-14
Updated 2026-08-12
Modified 2024-04-23
Fix URL N/A

Affected Packages

Software From version Fixed in
drupal/core 8.0 8.3.4
drupal/drupal 8.0 8.3.4

Exploit Protection

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CVE-2017-6920 carries CVSS 9.5 Critical rating. BotEraser checks your installation against this and other known CVE records, and blocks IPs associated with exploit activity.

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