CVE-2016-2161

Publication date 22 December 2016

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In Apache HTTP Server versions 2.4.0 to 2.4.23, malicious input to mod_auth_digest can cause the server to crash, and each instance continues to crash even for subsequently valid requests.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	17.04 zesty	Not affected
	16.10 yakkety	Fixed 2.4.18-2ubuntu4.1
	16.04 LTS xenial	Fixed 2.4.18-2ubuntu3.2
	14.04 LTS trusty	Fixed 2.4.7-1ubuntu4.15
	12.04 LTS precise	Not affected

Patch details

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

Package	Patch details
apache2	Upstream: https://svn.apache.org/viewvc?view=revision&revision=1772919 Upstream: https://svn.apache.org/viewvc?view=revision&revision=1773069

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-3279-1
Apache HTTP Server vulnerabilities
9 May 2017