Security readout for executives and security teams
Plain-English summary
CVE-2021-37458 is a stored cross-site scripting issue in NCH Axon PBX v2.22 and earlier. Malicious content placed in the primary phone field could later run in another user’s browser when viewed. The sources do not provide a CVSS score, affected CPEs, fixed version, or vendor mitigation.
Executive priority
Prioritize if Axon PBX is internet-accessible, used by many staff, or allows external users to modify contact data. If confined to trusted administrators, handle through normal patch and hardening workflows while monitoring vendor guidance.
Technical view
The CVE describes stored XSS in NCH Axon PBX through the primary phone field. Stored XSS can affect users who view persisted attacker-controlled data in the PBX interface. The public record names v2.22 and earlier, but the supplied metadata lacks CWE, CVSS, CPE, and remediation details.
Likely exposure
Exposure is likely limited to organizations running NCH Axon PBX v2.22 or earlier, especially where untrusted users can create or modify records containing the primary phone field. Internet-exposed PBX administration or user portals would increase business risk.
Exploitation context
The source bundle cites a public proof-of-concept write-up, but CISA KEV status is false and no supplied source confirms active exploitation. Treat this as publicly disclosed and plausibly testable, not as confirmed exploited in the wild.
Researcher notes
Evidence is narrow: the CVE description and reference identify stored XSS via the primary phone field in Axon PBX v2.22 and earlier. The supplied sources do not identify a fixed version, exploitation telemetry, authentication requirements, privilege impact, or browser execution context.
Mitigation direction
- Identify any NCH Axon PBX deployments and confirm exact versions.
- Check NCH guidance for a fixed release or vendor-recommended mitigation.
- Restrict PBX administrative and user interfaces to trusted networks.
- Limit who can edit records containing the primary phone field.
- Review existing primary phone values for unexpected markup or script-like content.
Validation and detection
- Inventory PBX hosts and verify whether Axon PBX is installed.
- Confirm whether any deployment is v2.22 or earlier.
- Review access paths to forms containing the primary phone field.
- Check whether untrusted users can submit or edit that field.
- Assess logs for suspicious record edits or unusual PBX interface activity.
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
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CVE-2021-37458 mapping review
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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.nch.com.au/pbx/index.htmlCVE reference · x_refsource_MISC
- https://github.com/0xfml/poc/blob/main/NCH/Axon_2.22_XSS.mdCVE 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.