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CVE-2018-13441

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference...

5.5 MediumPublic exploitFix available

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Attack profile

How easy it is to exploit

Attack vector
Local
Complexity
Low
Privileges needed
Low
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

1.34%Down 4.9 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 5.5

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Record
CVE-2018-13441
CVSS 3.0
5.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
2.1 LowAV:L/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-476
Updated
2026-11-02
CVE List No score

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Record
CVE-2018-13441
Updated
2026-11-02
EUVDEUVD-2018-5383 No score

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Record
EUVD-2018-5383
Updated
2026-11-03
GitHub AdvisoriesGHSA-vcwh-ghpm-79h9 5.5

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference...

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Record
GHSA-vcwh-ghpm-79h9
CVSS 3.0
5.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-476
Updated
2026-11-02
OSV 5.5

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Record
CVE-2018-13441
CVSS 3.0
5.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVDEBIAN-CVE-2018-13441 5.5

qh_help in Nagios Core version 4.4.1 and earlier is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket.

Record
DEBIAN-CVE-2018-13441
CVSS 3.0
5.5 MediumCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVMGASA-2019-0104 No score

Updated nagios packages fix security vulnerability

A flaw was found in Nagios Core version 4.4.1 and earlier. The qh_help function is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket (CVE-2018-13441).

A flaw was found in Nagios Core version 4.4.1 and earlier. The qh_echo function is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket (CVE-2018-13457).

A flaw was found in Nagios Core version 4.4.1 and earlier. The qh_core function is prone to a NULL pointer dereference vulnerability, which allows attacker to cause a local denial-of-service condition by sending a crafted payload to the listening UNIX socket (CVE-2018-13458).

A cross-site scripting (XSS) vulnerability has been discovered in Nagios Core. This vulnerability allows attackers to place malicious JavaScript code into the web frontend through manipulation of plugin output. In order to do this the attacker needs to be able to manipulate the output returned by nagios checks, e.g. by replacing a plugin on one of the monitored endpoints. Execution of the payload then requires that an authenticated user creates an alert summary report which contains the corresponding output (CVE-2018-18245).

Record
MGASA-2019-0104
Updated
2026-11-02
OSVopenSUSE-SU-2020:0500-1 No score

Security update for nagios

This update for nagios to version 4.4.5 fixes the following issues:

  • CVE-2019-3698: Symbolic link following vulnerability in the cronjob allows local attackers to cause cause DoS or potentially escalate privileges. (boo#1156309)
  • CVE-2018-18245: Fixed XSS vulnerability in Alert Summary report (boo#1119832)
  • CVE-2018-13441, CVE-2018-13458, CVE-2018-13457: Fixed a few denial of service vulnerabilities caused by null pointer dereference (boo#1101293, boo#1101289, boo#1101290).
Record
openSUSE-SU-2020:0500-1
Updated
2026-11-02
OSVopenSUSE-SU-2020:0517-1 No score

Security update for nagios

This update for nagios to version 4.4.5 fixes the following issues:

  • CVE-2019-3698: Symbolic link following vulnerability in the cronjob allows local attackers to cause cause DoS or potentially escalate privileges. (boo#1156309)
  • CVE-2018-18245: Fixed XSS vulnerability in Alert Summary report (boo#1119832)
  • CVE-2018-13441, CVE-2018-13458, CVE-2018-13457: Fixed a few denial of service vulnerabilities caused by null pointer dereference (boo#1101293, boo#1101289, boo#1101290).

This update was imported from the openSUSE:Leap:15.1:Update update project.

Record
openSUSE-SU-2020:0517-1
Updated
2026-11-02
OSVopenSUSE-SU-2024:11073-1 No score

nagios-4.4.6-2.5 on GA media

These are all security issues fixed in the nagios-4.4.6-2.5 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2024:11073-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
nagios4
Debian:12
 before 4.3.4-3
4.3.4-3
nagios4
Debian:13
 before 4.3.4-3
4.3.4-3
nagios4
Debian:14
 before 4.3.4-3
4.3.4-3
nagios
Mageia:6
From an advisory covering 4 CVEs
 before 4.3.1-2.2.mga6
4.3.1-2.2.mga6
nagios
openSUSE:Leap 15.1
From an advisory covering 5 CVEs
 before 4.4.5-lp151.5.4.1
4.4.5-lp151.5.4.1
nagios
SUSE:Package Hub 15 SP1
From an advisory covering 5 CVEs
 before 4.4.5-bp151.4.3.1
4.4.5-bp151.4.3.1
nagios
openSUSE:Tumbleweed
From an advisory covering 17 CVEs
 before 4.4.6-2.5
4.4.6-2.5

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
Exploit-DBNagios Core 4.4.1 - Denial of Service2018-07-24

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, Exploit-DB, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-13441 is a medium vulnerability (CVSS 5.5) in Nagios, published July 12, 2018. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 1.34%, the 71st percentile. Fixed in nagios4 4.3.4-3.

References

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