Nagios XI 5.5.6 allows remote authenticated attackers to execute arbitrary commands via a crafted HTTP request.

published 2018-11-14 7 y ago modified 2026-06-17 4 mo ago also EUVD-2018-7579

cvss: 8.8; version 3.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 21.0%; EPSS 21.0% chance of exploitation in 30 days, percentile 97%
public exploits: 0; none known

Exploit prediction

21.02% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

tenable.com https://www.tenable.com/security/research/tra-2018-37 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	6.5	AV:N/AC:L/Au:S/C:P/I:P/A:P

Affected products

Nagios Nagios XI

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

tenable.com /security/research/tra-2018-37
exploit, third-party-advisory

Sources

CVE List CVE-2018-15709
NVD CVE-2018-15709

Fencer Vulns 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.

Summary