CVE-2018-16844

nginx: Excessive CPU usage via flaw in HTTP/2 implementation

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

nginx before versions 1.15.6 and 1.14.1 has a vulnerability in the implementation of HTTP/2 that can allow for excessive CPU usage. This issue affects nginx compiled with the ngx_http_v2_module (not compiled by default) if the 'http2' option of the 'listen' directive is used in a configuration file.

nginx en versiones anteriores a la 1.15.6 y 1.14.1 tiene una vulnerabilidad en la implementación de HTTP/2 que puede permitir el uso excesivo de CPU. Este problema afecta a nginx compilado con ngx_http_v2_module (no compilado por defecto) si la opción "hppt2" de la directiva "listen" se emplea en un archivo de configuración.

*Credits: N/A

CVSS Scores

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-09-11 CVE Reserved
2018-11-07 CVE Published
2024-08-05 CVE Updated
2024-08-22 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-400: Uncontrolled Resource Consumption

CAPEC

References (13)

URL	Tag	Source
http://seclists.org/fulldisclosure/2021/Sep/36	Mailing List
http://www.securityfocus.com/bid/105868	Third Party Advisory
http://www.securitytracker.com/id/1042038	Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16844	Issue Tracking
https://support.apple.com/kb/HT212818	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00035.html	2022-02-22
http://mailman.nginx.org/pipermail/nginx-announce/2018/000220.html	2022-02-22
https://access.redhat.com/errata/RHSA-2018:3680	2022-02-22
https://access.redhat.com/errata/RHSA-2018:3681	2022-02-22
https://usn.ubuntu.com/3812-1	2022-02-22
https://www.debian.org/security/2018/dsa-4335	2022-02-22
https://access.redhat.com/security/cve/CVE-2018-16844	2018-11-27
https://bugzilla.redhat.com/show_bug.cgi?id=1644510	2018-11-27

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
F5 Search vendor "F5"		Nginx Search vendor "F5" for product "Nginx"				>= 1.9.5 < 1.14.1 Search vendor "F5" for product "Nginx" and version " >= 1.9.5 < 1.14.1"		-		Affected
F5 Search vendor "F5"		Nginx Search vendor "F5" for product "Nginx"				>= 1.15.0 < 1.15.6 Search vendor "F5" for product "Nginx" and version " >= 1.15.0 < 1.15.6"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				14.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "14.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				16.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "16.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.04 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.04"		lts		Affected
Canonical Search vendor "Canonical"		Ubuntu Linux Search vendor "Canonical" for product "Ubuntu Linux"				18.10 Search vendor "Canonical" for product "Ubuntu Linux" and version "18.10"		-		Affected
Apple Search vendor "Apple"		Xcode Search vendor "Apple" for product "Xcode"				< 13.0 Search vendor "Apple" for product "Xcode" and version " < 13.0"		-		Affected