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Vulnerability details: VCID-tjr6-dduq-mkaj
Vulnerability ID VCID-tjr6-dduq-mkaj
Aliases CVE-2017-6920
GHSA-9c24-g32g-35rj
Summary 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.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (4)
CWE-94 Improper Control of Generation of Code ('Code Injection')
CWE-1035 OWASP Top Ten 2017 Category A9 - Using Components with Known Vulnerabilities
CWE-19 Data Processing Errors
CWE-937 OWASP Top Ten 2013 Category A9 - Using Components with Known Vulnerabilities
System Score Found at
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
epss 0.67036 https://api.first.org/data/v1/epss?cve=CVE-2017-6920
cvssv3.1_qr CRITICAL https://github.com/advisories/GHSA-9c24-g32g-35rj
cvssv3.1 9.8 https://github.com/drupal/core
generic_textual CRITICAL https://github.com/drupal/core
cvssv3.1 9.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6920.yaml
generic_textual CRITICAL https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6920.yaml
cvssv3.1 9.8 https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6920.yaml
generic_textual CRITICAL https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6920.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2017-6920
cvssv3 9.8 https://nvd.nist.gov/vuln/detail/CVE-2017-6920
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2017-6920
generic_textual CRITICAL https://nvd.nist.gov/vuln/detail/CVE-2017-6920
cvssv3.1 9.8 https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple
generic_textual CRITICAL https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple
cvssv3.1 9.8 https://www.drupal.org/SA-CORE-2017-003
generic_textual CRITICAL https://www.drupal.org/SA-CORE-2017-003
cvssv3.1 9.8 http://www.securityfocus.com/bid/99211
generic_textual CRITICAL http://www.securityfocus.com/bid/99211
cvssv3.1 9.8 http://www.securitytracker.com/id/1038781
generic_textual CRITICAL http://www.securitytracker.com/id/1038781
Reference id Reference type URL
https://api.first.org/data/v1/epss?cve=CVE-2017-6920
https://github.com/drupal/core
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6920.yaml
https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6920.yaml
https://nvd.nist.gov/vuln/detail/CVE-2017-6920
https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple
https://www.drupal.org/SA-CORE-2017-003
http://www.securityfocus.com/bid/99211
http://www.securitytracker.com/id/1038781
cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
GHSA-9c24-g32g-35rj https://github.com/advisories/GHSA-9c24-g32g-35rj
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/drupal/core
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/core/CVE-2017-6920.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/FriendsOfPHP/security-advisories/blob/master/drupal/drupal/CVE-2017-6920.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2017-6920
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2017-6920
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2017-6920
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://www.drupal.org/SA-CORE-2017-003
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.securityfocus.com/bid/99211
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at http://www.securitytracker.com/id/1038781
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.98473
EPSS Score 0.67036
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T09:05:55.291455+00:00 GithubOSV Importer Import https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2022/05/GHSA-9c24-g32g-35rj/GHSA-9c24-g32g-35rj.json 37.0.0