CVE-2016-6874

CRITICAL

The array_*_recursive functions in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, related to recursion.

Affects 1 product across 1 vendor.

CVSS 3.09.8
EPSS2.0%
Percentile80th
PatchUnknown
CVSS Vector — Plain English Remotely exploitable over the network, low complexity, no authentication required, no user interaction needed, impact contained to the vulnerable component, full confidentiality impact, full integrity impact, full availability impact.
◆ AI Analysis — automated analysis, not human-reviewed

This vulnerability was disclosed in 2017. A critical vulnerability affects Facebook systems (CVE-2016-6874). No public exploit code is currently available. Isolate affected systems if patching is not feasible.

BSID: BS-2017-GLOBAL-340421-C • Model: rule-based-v1 • Confidence: MEDIUM

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Frequently Asked Questions
What is CVE-2016-6874?
This vulnerability was disclosed in 2017. A critical vulnerability affects Facebook systems (CVE-2016-6874). No public exploit code is currently available. Isolate affected systems if patching is not feasible.
What is the CVSS score for CVE-2016-6874?
CVE-2016-6874 has CVSS 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS: 2.0%.
Is CVE-2016-6874 actively exploited?
No confirmed active exploitation of CVE-2016-6874 as of 2026-09-25.
How do I remediate CVE-2016-6874?
Priority: MEDIUM.
What systems are affected by CVE-2016-6874?
CVE-2016-6874 affects Facebook Hhvm.
Vulnerability Details
CVE IDCVE-2016-6874
BSIDBS-2017-GLOBAL-340421-C BreachSpider Global ID
CVSS VectorCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published2017-02-17
Last Modified2026-06-17
ICS Relevance0%
SourceNVD
Official Description

The array_*_recursive functions in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, related to recursion.

Source: NIST NVD / MITRE CVE Database

Attack Vector Analysis — CITED Relevance

Vulnerability details: The array_*_recursive functions in Facebook HHVM before 3.15.0 allows attackers to have unspecified impact via unknown vectors, related to recursion. CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

Exploitation Likelihood: LOW

Affected Products
VendorProductAffected Versions
Facebook Hhvm ≤ 3.14.5
Remediation

No official vendor advisory link on record. See the CVE record →

Threat Intelligence
● Threat Intelligence Validated: October 2026 | Threat Age: 3527 Days
CISA known-exploitedNot in KEV catalog
Public ExploitNot confirmed
PoC CodeNot confirmed
AI Enrichment Record — provenance & audit hash
Modelrule-based-v1
ConfidenceMEDIUM
Enriched At2026-05-24
SHA-512 Audit Hash9d3827e6cf61c6d7015e88a1242b70aedff96530267d9f5852515cd1e7074302cb86f31adeae6c8502a522e6f0f62f0d8091e0ed3e6ae2a420cf808e02f5518b
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