CVE-2021-40345

7.2 HIGH

An issue was discovered in Nagios XI 5.8.5

Published: 2021-10-26 · Last updated: 2026-06-17

Severity and scoring

CVSS: 7.2 HIGH
Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
CWE: CWE-77

Affected products

Vendor	Product
nagios	nagios_xi

Description

An issue was discovered in Nagios XI 5.8.5. In the Manage Dashlets section of the Admin panel, an administrator can upload ZIP files. A command injection (within the name of the first file in the archive) allows an attacker to execute system commands.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2021-40345
[Vendor advisory]https://assets.nagios.com/downloads/nagiosxi/CHANGES-5.TXT
[Exploit reference]https://github.com/ArianeBlow/NagiosXI-EmersonFI/blob/main/README.md
[Other]https://synacktiv.com
[Exploit reference]https://www.synacktiv.com/sites/default/files/2021-10/Nagios_XI_multiple_vulnerabilities_0.pdf
[Vendor advisory]https://assets.nagios.com/downloads/nagiosxi/CHANGES-5.TXT
[Exploit reference]https://github.com/ArianeBlow/NagiosXI-EmersonFI/blob/main/README.md
[Other]https://synacktiv.com
[Exploit reference]https://www.synacktiv.com/sites/default/files/2021-10/Nagios_XI_multiple_vulnerabilities_0.pdf

Related CVEs

Same vendor

CVE-2021-40344 — An issue was discovered in Nagios XI 5.8.5 (7.2 HIGH)
CVE-2021-40343 — An issue was discovered in Nagios XI 5.8.5 (7.8 HIGH)
CVE-2021-38156 — In Nagios XI before 5.8.6, XSS exists in the dashboard page (/dashboards/#) when administrative users attempt to edit a dashboard (5.4 MEDIUM)
CVE-2021-3277 — Nagios XI 5.7.5 and earlier allows authenticated admins to upload arbitrary files due to improper validation of the rename functionality ... (7.2 HIGH)
CVE-2021-3273 — Nagios XI below 5.7 is affected by code injection in the /nagiosxi/admin/graphtemplates.php component (7.2 HIGH)

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CVE-2026-12223 — A vulnerability was identified in Yealink SIP-T46U 108.86.0.118 (5.5 MEDIUM)
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CVE-2026-12197 — A security flaw has been discovered in Ruijie EG105G-P 2.340 (7.2 HIGH)