CVE-2016-1000111

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.

Published: 2020-03-11 Last update: 2024-11-25 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2016-1000111 is rated Moderate Risk (45.3/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.58%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2016-1000111

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-04-23 0.69% 0.58% -0.11%
2 2025-11-30 0.51% 0.69% +0.19%
3 2025-11-03 — 0.51% —

Full EPSS history (10 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2016-1000111

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2016-1000111

GitHub Security Advisory for CVE-2016-1000111

OS Trackers for CVE-2016-1000111

vendor priority summary link
alpine — CVE-2016-1000111: 1 source package rows (py3-twisted); 7 state rows across 7 repos (3.17-community, 3.18-community, 3.19-community, 3.20-community, 3.21-community, 3.22-community, edge-community); fixed 7, open 0. https://security.alpinelinux.org/vuln/CVE-2016-1000111
debian unimportant CVE-2016-1000111 unimportant priority: Debian including 1 source packages (twisted), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2016-1000111
redhat high — https://access.redhat.com/security/cve/CVE-2016-1000111
suse medium CVE-2016-1000111 severity moderate: SUSE including 4 source package names (python-Twisted-15.2.1-8.1, python-twisted-web-12.1.0-5.el7_2, python3-Twisted-16.4.1-1.2, python3-Twisted-doc-16.4.1-1.2), 6 product×package rows across 5 product lines (SUSE Enterprise Storage 3, SUSE Enterprise Storage 4, … (5 product lines)): Fixed 6. https://www.suse.com/security/cve/CVE-2016-1000111/
ubuntu low CVE-2016-1000111 low priority: Ubuntu including 2 source packages (twisted, twisted-py3), 22 status rows across 11 suites (artful, bionic, cosmic, disco, precise, trusty, upstream, wily, xenial, yakkety, zesty): DNE 9, ignored 5, not-affected 4, needed 2, released 2. https://ubuntu.com/security/CVE-2016-1000111

Affected software / configurations for CVE-2016-1000111

Vendor Product Version Raw CPE
twisted twisted < 16.3.1 cpe:2.3:a:twisted:twisted:*:*:*:*:*:*:*:*

References for CVE-2016-1000111

cvelogic Threat Intelligence