How severe is CVE-2018-13441?

CVE-2018-13441 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-13441 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-13441?

CVE-2018-13441 affects Nagios. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-13441?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2018-13441 published?

CVE-2018-13441 was published on 2018-07-12 and last updated on 2026-06-17.

CVE-2018-13441

CVE-2018-13441 is a medium-severity vulnerability in Nagios with a CVSS 3.x base score of 5.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-476.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 1% (68th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-476
Affected product: Nagios
Published: 2018-07-12
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2018-13441?: 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.
How severe is CVE-2018-13441?: CVE-2018-13441 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-13441 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (68th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-13441?: CVE-2018-13441 affects Nagios. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-13441?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2018-13441 published?: CVE-2018-13441 was published on 2018-07-12 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nagios:nagios:*:*:*:*:*:*:*:*

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