Security readout for executives and security teams
Plain-English summary
Older Nagios XI systems, before 5.8.5, have a local privilege escalation flaw tied to unsanitized database input used by cleaner.php. This is not a remote-first issue in the supplied evidence, but it can worsen a foothold on a monitoring server that may have broad operational visibility.
Executive priority
Treat this as a focused remediation item for Nagios XI monitoring servers, especially if they are operationally privileged. Patch older installations, but avoid emergency active-exploitation assumptions unless new evidence appears.
Technical view
CVE-2021-37349 affects Nagios XI before 5.8.5. The reported root cause is insufficient sanitization of input read from the database by cleaner.php, enabling local privilege escalation. The source bundle does not provide CVSS, CWE, exploit details, or confirmed affected CPEs.
Likely exposure
Exposure is likely limited to Nagios XI deployments running versions earlier than 5.8.5. Systems are higher concern where untrusted users, compromised accounts, or application paths can influence database content used by cleaner.php.
Exploitation context
The supplied bundle does not show CISA KEV listing or active exploitation evidence. Because this is described as local privilege escalation, exploitation likely requires prior local access or another way to place attacker-controlled data in the database.
Researcher notes
Evidence is sparse: the public description names cleaner.php, database input sanitization, and a fixed version boundary. No CVSS vector, CWE, exploit status, indicators, or detailed vulnerable code path is included in the provided sources.
Mitigation direction
- Upgrade Nagios XI to version 5.8.5 or later.
- Review Nagios XI changelog and vendor guidance for related fixes.
- Restrict shell and administrative access on Nagios XI hosts.
- Limit database write privileges to trusted application paths only.
- Prioritize monitoring servers with broad infrastructure access.
Validation and detection
- Inventory all Nagios XI instances and record installed versions.
- Flag any Nagios XI version earlier than 5.8.5.
- Review who has local access to affected Nagios XI hosts.
- Review database accounts that can modify data consumed by Nagios XI.
- Check vendor release notes before closing remediation tickets.
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.
Privilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupDatabase behavior lookup
The CVE wording references database injection or access, so collection and exfiltration review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-37349 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.