What is CVE-2016-6874?

CVE-2016-6874 is a critical-severity vulnerability in Facebook Hhvm. CVSS score: 9.8/10. Published 2017-02-17.

How severe is CVE-2016-6874?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Facebook Hhvm

CVE-2016-6874

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

Published 2017-02-17 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.1th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.020 · newest: 0.020 · change: 0.000

Affected products

Facebook Hhvm

References

www.openwall.com/lists/oss-security/2016/08/11/1 (mailing-list)
www.openwall.com/lists/oss-security/2016/08/19/1 (mailing-list)
github.com/facebook/hhvm/commit/05e706d98f748f609b19d8697e490eaab5007d69

Frequently asked questions

What is CVE-2016-6874?: CVE-2016-6874 is a critical-severity vulnerability in Facebook Hhvm. CVSS score: 9.8/10. Published 2017-02-17.
How severe is CVE-2016-6874?: Critical severity. CVSS v3 base score is 9.8 out of 10.