CVE-2006-20001

Publication date 17 January 2023

Last updated 4 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

A carefully crafted If: request header can cause a memory read, or write of a single zero byte, in a pool (heap) memory location beyond the header value sent. This could cause the process to crash. This issue affects Apache HTTP Server 2.4.54 and earlier.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
apache2	25.10 questing	Fixed 2.4.55-1ubuntu1
	25.04 plucky	Fixed 2.4.55-1ubuntu1
	24.10 oracular	Fixed 2.4.55-1ubuntu1
	24.04 LTS noble	Fixed 2.4.55-1ubuntu1
	23.10 mantic	Fixed 2.4.55-1ubuntu1
	23.04 lunar	Fixed 2.4.55-1ubuntu1
	22.10 kinetic	Fixed 2.4.54-2ubuntu1.1
	22.04 LTS jammy	Fixed 2.4.52-1ubuntu4.3
	20.04 LTS focal	Fixed 2.4.41-4ubuntu3.13
	18.04 LTS bionic	Fixed 2.4.29-1ubuntu4.26
	16.04 LTS xenial	Fixed 2.4.18-2ubuntu3.17+esm8
	14.04 LTS trusty	Vulnerable

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Patch details

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

Package	Patch details
apache2	Upstream: 7469547

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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H