Apache 2.4.17 / 2.4.18 DoS

medium Nessus Plugin ID 122059


The remote web server is affected by a denial of service vulnerability.


According to its banner, the version of Apache running on the remote host is either 2.4.17 or 2.4.18.

A denial of service (DoS) vulnerability exists in server threads due to a lengthy thread-block time. An unauthenticated, remote attacker can exploit this issue, to block server threads, and causing the application to stop responding.


Upgrade to Apache version 2.4.20 or later.

See Also



Plugin Details

Severity: Medium

ID: 122059

File Name: apache_2_4_20.nasl

Version: 1.5

Type: combined

Agent: windows, macosx, unix

Family: Web Servers

Published: 2/8/2019

Updated: 4/11/2022

Configuration: Enable thorough checks

Supported Sensors: Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent

Risk Information


Risk Factor: Low

Score: 3.6


Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.2

Vector: AV:N/AC:M/Au:N/C:N/I:N/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS Score Source: CVE-2016-1546


Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:apache:http_server

Required KB Items: installed_sw/Apache

Exploit Ease: No known exploits are available

Patch Publication Date: 4/11/2016

Vulnerability Publication Date: 4/11/2016

Reference Information

CVE: CVE-2016-1546

BID: 92331