CVE-2016-1000111

mediumpriority · track · 22EPSS 0.028 · 86 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

2.76% (86th) EPSS

CVSS 5 · medium

Is it mine?

20 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · osv · cert_bund

EPSS · scored 2026-10-27

Twisted before 16.3.1 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.

cvss

Technical severity, 0–10. One row per scoring source.

5.3

010

base score 0–10 · higher = more severe · hover a vector to decode

v2.05mediumAV:N/AC:L/Au:N/C:N/I:P/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 1.4

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · OSV

v3.14.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-425USprimaryCWE-425US

affected products (20)

Products and version ranges known to be affected.

Apache HTTP Serverall versionscert_bundDEcpe:/a:apache:http_server:-
Apache Tomcatall versionscert_bundDEcpe:/a:apache:tomcat:-
Debian Linuxall versionscert_bundDEcpe:/o:debian:debian_linux:-
EMC VNXall versionscert_bundDEcpe:/h:emc:vnx:-
HPE HP-UXall versionscert_bundDEcpe:/o:hp:hp-ux:-
Open Source CentOSall versionscert_bundDEcpe:/o:centos:centos:-
Open Source PHPall versionscert_bundDEcpe:/a:php:php:-
Open Source Pythonall versionscert_bundDEcpe:/a:python:python:-
Red Hat Enterprise Linuxall versionscert_bundDEcpe:/o:redhat:enterprise_linux:-
Red Hat JBoss Web Serverall versionscert_bundDEcpe:/a:redhat:jboss_enterprise_web_server:-
SUSE Linuxall versionscert_bundDEcpe:/o:suse:suse_linux:-
SUSE Linux Enterprise Desktop 12 SP1all versionscert_bundDEcpe:/o:suse:linux_enterprise_desktop:12:sp1
SUSE Linux Enterprise Server 12 SP1all versionscert_bundDEcpe:/o:suse:linux_enterprise_server:12:sp1
SUSE openSUSEall versionscert_bundDEcpe:/o:suse:opensuse:-
TYPO3 Core <8.2.1all versionscert_bundDE
Ubuntu Linux 10.04 LTSall versionscert_bundDEcpe:/o:canonical:ubuntu_linux:10.04:-:lts
TYPO3 Core< 8.2.1cert_bundDE
n/a n/a≤ n/aenisa_euvdEU
twisted twisted< 16.3.1nvdUScpe:2.3:a:twisted:twisted:*:*:*:*:*:*:*:*
PyPI twisted< 16.3.1osvUSpkg:pypi/twisted

advisories (3)

Vendor and ecosystem advisories describing this.

WID-SEC-W-2025-2522Mehrere Webserver: Schwachstelle ermöglicht Umgehen von SicherheitsvorkehrungenDeutsch2016-07-18csaf · cert_bundDE
Ein entfernter, anonymer Angreifer kann eine Schwachstelle in mehreren Webserver Produkten ausnutzen, um Sicherheitsvorkehrungen zu umgehen.
GHSA-3gqj-cmxr-p4x2Forced Browsing in Twisted2021-04-30ghsa · osvUS
Twisted before 16.3.1 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.
PYSEC-2020-2142020-03-11vendor · osvUS
Twisted before 16.3.1 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.

also known as (6)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv cert_bund nvd NVD CVE.org MITRE

published 2020-03-11modified 2026-06-17

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Related entries.

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+407 more

references (13)

External citations — patches, advisories, analysis.

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