CVE-2021-3277

7.2 highEPSS 59%

High (7.2) in nagios nagios xi. EPSS 59% chance of exploitation in the next 30 days.

Nagios XI 5.7.5 and earlier allows authenticated admins to upload arbitrary files due to improper validation of the rename functionality in custom-includes component, which leads to remote code execution by uploading php files.

Severity

CVSS 3.1

7.2 high

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS: 59% chance of exploitation in the next 30 days; higher than 99% of CVEs (scores of 2026-10-31)
CWE: CWE-434
Published: 2021-06-07
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nagios:nagios_xi

References

https://asaf.me/2021/01/21/nagios-xi-5-7-5-remote-code-execution/
https://asaf.me/2021/01/21/nagios-xi-5-7-5-remote-code-execution/

Check your stack JSON