CVE-2011-4968

Publication date 19 November 2019

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

nginx http proxy module does not verify peer identity of https origin server which could facilitate man-in-the-middle attack (MITM)

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
nginx	15.04 vivid	Ignored end of life
	14.10 utopic	Ignored end of life
	14.04 LTS trusty	Ignored see notes
	13.10 saucy	Ignored end of life
	13.04 raring	Ignored end of life
	12.10 quantal	Ignored end of life
	12.04 LTS precise	Ignored end of life
	11.10 oneiric	Ignored end of life
	10.04 LTS lucid	Ignored end of life
	8.04 LTS hardy	Ignored end of life

Notes

seth-arnold

Backporting this fix is non-trivial and may break deployed applications. Someone who really wanted this could use stunnel as a work-around until 16.04 LTS is released.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
nginx	Upstream: http://trac.nginx.org/nginx/changeset/060c2e692b96a150b584b8e30d596be1f2defa9c/nginx

Severity score breakdown

Parameter	Value
Base score	4.8 · Medium
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	Low
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N