Security readout for executives and security teams
Plain-English summary
CVE-2021-37455 is a reported stored cross-site scripting issue in NCH Axon PBX v2.22 and earlier. A malicious value in the outbound dialing plan could later run script in another user's browser. Business risk depends on whether this legacy PBX administration surface is still deployed and reachable.
Executive priority
Treat this as a targeted legacy-asset risk. It is not proven actively exploited, but PBX administration compromise can affect communications operations, so exposed or unsupported instances should be reviewed promptly.
Technical view
The CVE describes stored XSS through the outbound dialing plan in NCH Axon PBX v2.22 and earlier. The public record does not provide CVSS, CWE, authentication requirements, affected deployment modes, or vendor remediation details. A public proof-of-concept reference exists, but KEV does not list active exploitation.
Likely exposure
Exposure is likely limited to organizations still running NCH Axon PBX v2.22 or earlier, especially where the management interface is reachable by untrusted users or broad internal networks.
Exploitation context
The source bundle supports public disclosure and a public proof-of-concept reference. It does not support claims of active exploitation, ransomware use, or inclusion in CISA KEV.
Researcher notes
Evidence is sparse. The CVE names the product, version range, and stored XSS location, but omits CVSS, CWE, authentication context, patch status, and exploit prevalence. Avoid expanding scope beyond Axon PBX v2.22 and earlier.
Mitigation direction
- Identify any NCH Axon PBX deployments and versions.
- Restrict PBX administration access to trusted management networks.
- Review vendor guidance for fixed versions or retirement advice.
- Prioritize upgrade, replacement, or compensating controls for v2.22 or earlier.
- Monitor admin accounts and PBX configuration changes for anomalies.
Validation and detection
- Inventory PBX assets and confirm exact Axon versions.
- Check whether the administration interface is internet reachable.
- Review outbound dialing plan fields for unexpected script-like content.
- Confirm access controls limit who can edit dialing plans.
- Search logs for unusual administrative changes around dialing plans.
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-2021-37455 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.