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CVE-2016-6875

31
FAUCET Score

CVE-2016-6875 describes an infinite recursion vulnerability in the wddx component of Facebook HHVM versions prior to 3.15.0. This critical vulnerability (CVSS 9.8) allows unauthenticated attackers to achieve high impact on confidentiality, integrity, and availability with low attack complexity, though the specific vectors are unspecified. Despite its high severity and a notable 10 community mentions, there is no known active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or KEV entry.

Impacted Technologies

VendorProductVersion(s)CPE
<= 3.14.5CPE matchmatch criteria
cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

9.8CRITICAL

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
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.22%
Probability of exploitation in next 30 days
EPSS Percentile
80.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0222 is in the 70th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / facebook/hhvm/commit/1888810e77b446a79a7674784d5f139fcfa605e2
Patch
openwall.com / lists/oss-security/2016/08/11/1
Mailing ListPatchThird Party Advisory
openwall.com / lists/oss-security/2016/08/19/1
Mailing ListPatchThird Party Advisory