CVE-2016-1000110

Severity: medium (CVSS 6.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2019-11-27 · updated 2026-06-17
Weakness: CWE-601

Description

The CGIHandler class in Python before 2.7.12 does not protect against the HTTP_PROXY variable name clash in a CGI script, which could allow a remote attacker to redirect HTTP requests.

Affected products

Debian Linux: 8.0, 9.0, 10.0
Fedoraproject Fedora: 23
Python: from 2.7.0 before 2.7.13; from 3.3.0 before 3.3.7; from 3.4.0 before 3.4.6; from 3.5.0 before 3.5.3 — fixed in 2.7.13, 3.3.7, 3.4.6, 3.5.3

How to fix

Upgrade to a fixed version: Python 2.7.13, 3.3.7, 3.4.6, 3.5.3. Check the vendor advisory for mitigations.

References

http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-1000110
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2016-1000110
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7K3WFJO3SJQCODKRKU6EQV3ZGHH53YPU/
https://security-tracker.debian.org/tracker/CVE-2016-1000110
http://lists.opensuse.org/opensuse-security-announce/2020-01/msg00040.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-1000110
https://bugzilla.suse.com/show_bug.cgi?id=CVE-2016-1000110
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7K3WFJO3SJQCODKRKU6EQV3ZGHH53YPU/
https://security-tracker.debian.org/tracker/CVE-2016-1000110

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