High severity · published Oct 30, 2025
CVE-2021-47700
Nagios XI < 5.8.7 Insecure Permissions on Highcharts Temporary Directory
7.8
CVSS
0.4%
EPSS
No
On KEV
Description
Nagios XI versions prior to 5.8.7 used a temporary directory for Highcharts exports with overly permissive ownership/permissions under the Apache user. Local or co-hosted processes could read/overwrite export artifacts or manipulate paths, risking disclosure or tampering and potential code execution depending on deployment.
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Local
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
XI
XI · Nagios
before 5.8.7 · source: vendor
NX
Nagios XI · Nagios
before 5.8.7 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-47700
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-47700
Release Notes
https://www.nagios.com/changelog/nagios-xi/
Third Party Advisory
https://www.vulncheck.com/advisories/nagios-xi-insecure-permissions-on-highcharts-temporary-directory
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