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Fencer Intel
medium 5.5

CVE-2018-13441 json

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 loc…

published 2018-07-12 8 y ago modified 2026-06-17 4 mo ago also EUVD-2018-5383

cvss
5.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.3%
EPSS 1.3% chance of exploitation in 30 days, percentile 71%
public exploits
1
Exploit-DB

Summary

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.

Patch / fix

  • nagios4 Debian 14, Debian 13, Debian 12 4.3.4-3

debian advisories DEBIAN-CVE-2018-13441

  • nagios openSUSE Tumbleweed 4.4.6-2.5
  • nagios Package Hub 15 SP1 4.4.5-bp151.4.3.1
  • nagios openSUSE Leap 15.1 4.4.5-lp151.5.4.1

opensuse advisories openSUSE-SU-2024:11073-1openSUSE-SU-2020:0517-1openSUSE-SU-2020:0500-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-13441 updated cvss 3.3

nagios: NULL pointer dereference in qh_help in base/query-handler.c

  • Red Hat Mobile Application Platform 4 nagios
    affected: no fix planned “Out of support scope”
  • Red Hat Storage 3 nagios, nagios-common
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Timeline

  1. Published
  2. First public exploit (EDB-45082)

Exploit prediction

1.34% chance of exploitation in the next 30 days, higher than 71% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • EDB-45082 Nagios Core 4.4.1 - Denial of Service dos, 2018-07-24
  • gist.github.com https://gist.github.com/fakhrizulkifli/8df4a174158df69ebd765f824bd736b8 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 5.5 CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.