Security readout for executives and security teams
Plain-English summary
CVE-2021-30461 affects VoIPmonitor web UI versions before 24.61. A user-supplied SPOOLDIR value could be written into a PHP configuration file, creating remote code execution risk. The source bundle does not provide CVSS, CWE, CPE, or confirmed exploitation evidence.
Executive priority
Treat this as a high-priority remediation item for any exposed VoIPmonitor deployment. Remote code execution in a monitoring web UI can lead to system compromise, but urgency should be calibrated against actual exposure and version confirmation.
Technical view
The issue occurs when the web UI recheck option handles the SPOOLDIR value and injects it into config/configuration.php. If that value contains PHP code, the application may persist attacker-controlled code into a PHP file. The advisory title indicates unauthenticated RCE, but the bundle’s technical detail is limited.
Likely exposure
Exposure is most likely where VoIPmonitor web UI before 24.61 is deployed, especially if reachable by untrusted users. The bundle does not provide affected CPEs, deployment prerequisites, or authentication details beyond the advisory reference title.
Exploitation context
The source bundle does not show CISA KEV listing or confirmed active exploitation. Public reference wording indicates a serious remote code execution class issue, but available evidence here is insufficient to claim exploitation in the wild.
Researcher notes
Key gaps: no CVSS vector, CWE, CPE, or detailed vendor matrix in the bundle. Validate version, route exposure, and configuration-file integrity. Do not assume active exploitation without external evidence beyond these sources.
Mitigation direction
- Check vendor guidance and update VoIPmonitor to 24.61 or later where applicable.
- Restrict access to the VoIPmonitor web UI to trusted networks.
- Review web UI authentication and exposure controls until remediation is complete.
- Monitor configuration files for unexpected changes.
Validation and detection
- Inventory all VoIPmonitor deployments and confirm installed versions.
- Identify whether the web UI is reachable from untrusted networks.
- Inspect config/configuration.php for unexpected SPOOLDIR values or PHP content.
- Review logs for suspicious recheck activity or configuration changes.
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.
Execution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-30461 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://ssd-disclosure.com/ssd-advisory--voipmonitor-unauth-rceCVE 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.