How severe is CVE-2016-3171?

CVE-2016-3171 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2016-3171 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2016-3171?

CVE-2016-3171 primarily affects Drupal. In total, 49 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2016-3171?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2016-3171 published?

CVE-2016-3171 was published on 2016-04-12 and last updated on 2026-06-17.

CVE-2016-3171

CVE-2016-3171 is a high-severity vulnerability in Drupal with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-19.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v2: 6.8
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-19
Affected product: Drupal
Published: 2016-04-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2016-3171?: 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.
How severe is CVE-2016-3171?: CVE-2016-3171 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2016-3171 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2016-3171?: CVE-2016-3171 primarily affects Drupal. In total, 49 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2016-3171?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2016-3171 published?: CVE-2016-3171 was published on 2016-04-12 and last updated on 2026-06-17.

References

Affected products (49)

cpe:2.3:a:drupal:drupal:6.0:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:beta1:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:beta2:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:beta3:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:beta4:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:dev:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:rc1:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:rc2:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:rc3:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.0:rc4:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.1:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.2:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.3:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.4:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.5:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.6:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.7:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.8:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.9:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.10:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.11:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.12:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.13:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.14:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.15:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.16:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.17:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.18:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.19:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.20:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.21:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.22:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.23:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.24:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.25:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.26:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.27:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.28:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.29:*:*:*:*:*:*:*
cpe:2.3:a:drupal:drupal:6.30:*:*:*:*:*:*:*

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Threat intelligence

Threat-intel indicators referencing this CVE:

45.84.120.3 (ipv4-addr)
221.161.235.168 (ipv4-addr)
200.196.50.91 (ipv4-addr)
187.141.71.166 (ipv4-addr)
187.110.238.50 (ipv4-addr)
116.255.252.44 (ipv4-addr)
113.164.66.10 (ipv4-addr)
103.38.219.22 (ipv4-addr)