CVE-2018-1333

Publication date 18 June 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

By specially crafting HTTP/2 requests, workers would be allocated 60 seconds longer than necessary, leading to worker exhaustion and a denial of service. Fixed in Apache HTTP Server 2.4.34 (Affected 2.4.18-2.4.30,2.4.33).

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	18.04 LTS bionic	Fixed 2.4.29-1ubuntu4.4
	16.04 LTS xenial	Not affected
	14.04 LTS trusty	Not affected

Notes

mdeslaur

artful and older don't enable http2 in the build. see CVE-2018-1302 for a whole http2 backport requirement

Patch details

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

Package	Patch details
apache2	Upstream: http://svn.apache.org/viewvc?view=revision&revision=1828879 Upstream: http://svn.apache.org/viewvc?view=revision&revision=1832487 Upstream: 808a94d

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-3783-1
Apache HTTP Server vulnerabilities
3 October 2018