HOMEVULNERABILITIESCVE-2016-1000109
MEDIUM

CVE-2016-1000109

CWE-665Published: February 19, 2020· Updated: Jun 17, 2026

5.3
CVSS v3.1

Official Description

HHVM does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and therefore does not protect CGI applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect a CGI application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue. This issue affects HHVM versions prior to 3.9.6, all versions between 3.10.0 and 3.12.4 (inclusive), and all versions between 3.13.0 and 3.14.2 (inclusive).

NVD Source

Technical Analysis

CVE-2016-1000109 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityLow
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Affected Vendors & Products

facebook1 product(s)
hhvm
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://github.com/facebook/hhvm/commit/423b4b719afd5ef4e6e19d8447fbf7b6bc0d0a25
PATCHhttps://github.com/facebook/hhvm/commit/423b4b719afd5ef4e6e19d8447fbf7b6bc0d0a25
ADVISORYhttps://httpoxy.org/
ADVISORYhttps://www.facebook.com/security/advisories/cve-2016-1000109
ADVISORYhttps://httpoxy.org/
ADVISORYhttps://www.facebook.com/security/advisories/cve-2016-1000109

All References (6)

→
https://github.com/facebook/hhvm/commit/423b4b719afd5ef4e6e19d8447fbf7b6bc0d0a25Patch · Third Party Advisory
→
https://httpoxy.org/Exploit · Mitigation · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2016-1000109Third Party Advisory
→
https://github.com/facebook/hhvm/commit/423b4b719afd5ef4e6e19d8447fbf7b6bc0d0a25Patch · Third Party Advisory
→
https://httpoxy.org/Exploit · Mitigation · Third Party Advisory
→
https://www.facebook.com/security/advisories/cve-2016-1000109Third Party Advisory

Quick Facts

CVE IDCVE-2016-1000109
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-665
CISA KEVNo
Affected1 vendor(s)
PublishedFeb 19, 2020

Related CVEs (CWE-665)

CVE-2023-20591
10.0
CVE-2015-8367
9.8
CVE-2008-0062
9.8
CVE-2018-11949
9.8
CVE-2019-14271
9.8
CVE-2022-37128
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2016-1000109 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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