Security readout for executives and security teams
Plain-English summary
Nagios XI versions before 5.8.5 have a local file inclusion flaw in index.php. In business terms, a vulnerable monitoring portal may allow unintended file access. The source bundle does not provide severity, prerequisites, or proof of active exploitation.
Executive priority
Treat this as a targeted upgrade and exposure-reduction item. Monitoring systems often hold sensitive operational visibility, but the source bundle lacks severity and exploitation evidence needed for emergency classification.
Technical view
CVE-2021-37348 describes improper pathname limitation in Nagios XI index.php, resulting in local file inclusion before version 5.8.5. The provided sources do not include CVSS, CWE, authentication requirements, affected CPEs, or exploit details.
Likely exposure
Exposure is limited to organizations running Nagios XI before 5.8.5. Risk is higher where the Nagios XI web interface is broadly reachable, especially from the internet or untrusted networks.
Exploitation context
CISA KEV status is false in the bundle, and no cited source states active exploitation. The bundle identifies the vulnerability class only; it does not provide public exploit status or attack prerequisites.
Researcher notes
The evidence is sparse: LFI in index.php before 5.8.5, with no CVSS, CWE, auth context, exploit maturity, or affected CPEs. Avoid assuming unauthenticated reachability or broader Nagios products from these sources.
Mitigation direction
- Upgrade Nagios XI to version 5.8.5 or later.
- Review the Nagios XI change log for vendor-specific guidance.
- Restrict Nagios XI web access to trusted administrative networks.
- Monitor the Nagios XI interface for unexpected file access attempts.
- Prioritize remediation for internet-facing or high-privilege monitoring deployments.
Validation and detection
- Inventory Nagios XI instances and record exact versions.
- Confirm no production instance runs below version 5.8.5.
- Review exposure of the Nagios XI web interface.
- Check logs for suspicious pathname or file access patterns.
- Document compensating controls where immediate upgrade is delayed.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-37348 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.nagios.com/downloads/nagios-xi/change-log/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.