CRITICAL
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 Aug 6, 2018
9.8
CRITICALCVSS 3.0
EPSS 20.48%
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.
Affected products
-
- Version 8 prior to 8.3.4StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Drupal.org | Drupal Core | n/a |
|
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
9.8 CRITICAL NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact High
7.5 HIGH NVD
AV:N/AC:L/Au:N/C:P/I:P/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
20.48% 0.20482
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.20482
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (29 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 20.48% (0.20482) | 97.44th | v5 (v2026.06.15) |
| Sep 22, 2026 | 20.48% (0.20482) | 97.39th | v5 (v2026.06.15) |
| Sep 21, 2026 | 15.56% (0.15557) | 96.73th | v5 (v2026.06.15) |
| Sep 6, 2026 | 20.48% (0.20482) | 97.34th | v5 (v2026.06.15) |
| Sep 5, 2026 | 15.56% (0.15557) | 96.66th | v5 (v2026.06.15) |
| Aug 30, 2026 | 20.48% (0.20482) | 97.32th | v5 (v2026.06.15) |
| Aug 28, 2026 | 15.56% (0.15557) | 96.64th | v5 (v2026.06.15) |
| Aug 24, 2026 | 20.48% (0.20482) | 97.30th | v5 (v2026.06.15) |
| Aug 23, 2026 | 15.56% (0.15557) | 96.63th | v5 (v2026.06.15) |
| Jun 15, 2026 | 20.48% (0.20482) | 97.17th | v5 (v2026.06.15) |
| Feb 20, 2026 | 66.15% (0.66148) | 98.47th | v4 (v2025.03.14) |
| Mar 25, 2025 | 68.00% (0.67997) | 98.50th | v4 (v2025.03.14) |
| Mar 24, 2025 | 71.77% (0.71774) | 98.67th | v4 (v2025.03.14) |
| Mar 19, 2025 | 73.58% (0.73583) | 98.72th | v4 (v2025.03.14) |
| Mar 17, 2025 | 71.77% (0.71774) | 98.65th | v4 (v2025.03.14) |
| Jan 30, 2025 | 3.94% (0.03942) | 91.97th | v3 (v2023.03.01) |
| Dec 17, 2024 | 5.22% (0.05221) | 92.90th | v3 (v2023.03.01) |
| Feb 8, 2024 | 6.57% (0.06571) | 93.48th | v3 (v2023.03.01) |
| Feb 6, 2024 | 6.98% (0.06976) | 93.31th | v3 (v2023.03.01) |
| Dec 28, 2023 | 6.64% (0.06639) | 93.09th | v3 (v2023.03.01) |
| Jul 31, 2023 | 7.39% (0.07391) | 93.18th | v3 (v2023.03.01) |
| Mar 7, 2023 | 7.34% (0.07336) | 92.98th | v3 (v2023.03.01) |
| Mar 6, 2023 | 5.63% (0.05634) | 90.24th | v2 (v2022.01.01) |
| Apr 1, 2022 | 5.63% (0.05634) | 89.29th | v2 (v2022.01.01) |
| Feb 4, 2022 | 5.63% (0.05634) | 76.84th | v2 (v2022.01.01) |
| Feb 3, 2022 | 1.83% (0.01828) | 35.38th | v1 |
| Jan 6, 2022 | 1.83% (0.01828) | 34.69th | v1 |
| Sep 1, 2021 | 1.83% (0.01828) | 74.99th | v1 |
| Apr 14, 2021 | 1.83% (0.01828) | 0.00th | v1 |
Weaknesses (2)
References (8)
- http://www.securityfocus.com/bid/99211 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1038781 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- 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://github.com/advisories/GHSA-9c24-g32g-35rj Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-6920
- https://www.drupal.org/SA-CORE-2017-003
- https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple x_refsource_CONFIRMPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/99211 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1038781 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| 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://github.com/advisories/GHSA-9c24-g32g-35rj | Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-6920 | ||
| https://www.drupal.org/SA-CORE-2017-003 | ||
| https://www.drupal.org/forum/newsletters/security-advisories-for-drupal-core/2017-06-21/drupal-core-multiple | x_refsource_CONFIRMPatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner drupal
Published Aug 6, 2018
Updated Sep 16, 2024
Reserved Mar 16, 2017
Link CVE-2017-6920
CISA Vulnrichment
GHSA-9C24-G32G-35RJ Updated n/a