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CVE-2016-1000109

22
FAUCET Score

CVE-2016-1000109, known as "httpoxy," is a vulnerability in HHVM versions prior to 3.9.6, 3.10.0-3.12.4, and 3.13.0-3.14.2. It allows remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server by injecting a crafted Proxy header into an HTTP request. The vulnerability has a CVSS v3.1 score of 5.3 (MEDIUM), indicating a network-based attack with low complexity and no user interaction required, potentially leading to information disclosure. While there is no known active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), the issue has received community attention and media coverage, suggesting awareness within the security community.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.9.6CPE matchmatch criteria
cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*
>= 3.10.0, <= 3.12.4CPE matchmatch criteria
cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*
>= 3.13.0, <= 3.14.2CPE matchmatch criteria
cpe:2.3:a:facebook:hhvm:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
5.08%
Probability of exploitation in next 30 days
EPSS Percentile
91.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0508 is in the 88th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 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/423b4b719afd5ef4e6e19d8447fbf7b6bc0d0a25
PatchThird Party Advisory
httpoxy.org
ExploitMitigationThird Party Advisory
facebook.com / security/advisories/cve-2016-1000109
Third Party Advisory