CVE-2016-3171

Drupal arbitrary code execution

8.1 HighFix available

Drupal 6.x before 6.38, when used with PHP before 5.4.45, 5.5.x before 5.5.29, or 5.6.x before 5.6.13, might allow remote attackers to execute arbitrary code via vectors related to session data truncation.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: High
Integrity: High
Availability: High

Exploit likelihood

3.19%Down 2.6 points since Feb 4, 2022

What each source reports

NVD Score used 8.1

Record: CVE-2016-3171
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0: 6.8 MediumAV:N/AC:M/Au:N/C:P/I:P/A:P
Weakness: CWE-19
Updated: 2026-11-02

CVE List No score

Record: CVE-2016-3171
Updated: 2026-11-02

EUVDEUVD-2022-2762 No score

Record: EUVD-2022-2762
Updated: 2026-11-03

GitHub AdvisoriesGHSA-69g8-g9jq-74v7 8.1

Drupal arbitrary code execution

Record: GHSA-69g8-g9jq-74v7
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94
Updated: 2026-11-02

OSV 8.1

Record: CVE-2016-3171
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVGHSA-69g8-g9jq-74v7 8.1

Drupal arbitrary code execution

Record: GHSA-69g8-g9jq-74v7
CVSS 3.0: 8.1 HighCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness: CWE-94
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`drupal/core` Packagist	6.0 up to 6.38	6.38
`drupal/drupal` Packagist	6.0 up to 6.38	6.38

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2016-3171 is a high vulnerability (CVSS 8.1) in Drupal, published April 12, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.19%, the 88th percentile. Fixed in drupal/core 6.38.