CVE-2025-66039

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 3.0%, top 14% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
Weaponized
9.8EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Metasploit, public exploit)
CISA-KEV: Not listedEPSS PROB: 3%CVSS: 9.8Exploit: Metasploit · public exploitExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

FreePBX Endpoint Manager is a module for managing telephony endpoints in FreePBX systems. Versions are vulnerable to authentication bypass when the authentication type is set to "webserver." When providing an Authorization header with an arbitrary value, a session is associated with the target user regardless of valid credentials. This issue is fixed in versions 16.0.44 and 17.0.23.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
85(Track)
EG Risk 85/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation65% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
3%
EPSS %ILE
86%
KEV
Not listed

Published

December 9, 2025

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Jul 26, 2026
Patch available. Sources: github.
github Patch Available

Authenticated Activation of Webserver Authentication Method in Advanced Settings Allows Subsequent Unauthenticated Logins · Advisory · FreePBX/security-reporting · GitHub

https://github.com/FreePBX/security-reporting/security/advisories/GHSA-9jvh-mv6x-w698

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 44× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-30 16:27 UTCEPSS rescore
  2. 2026-07-30 01:30 UTCEPSS rescore
  3. 2026-07-28 15:35 UTCEPSS rescore
  4. 2026-07-27 14:12 UTCEPSS rescore
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  10. 2026-07-23 14:18 UTCEPSS rescore
  11. 2026-07-23 14:18 UTCEPSS rescore
  12. 2026-07-23 13:19 UTCOSV refresh
  13. 2026-07-23 03:01 UTCEG score recompute
  14. 2026-07-22 14:08 UTCEPSS rescore
  15. 2026-07-21 15:24 UTCEPSS rescore
  16. 2026-07-20 17:08 UTCEPSS rescore
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  1. 2026-07-15 01:59 UTCEPSS rescore
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  4. 2026-07-12 05:46 UTCEPSS rescore
  5. 2026-07-11 08:27 UTCEPSS rescore
  6. 2026-07-09 19:09 UTCEPSS rescore
  7. 2026-07-08 15:15 UTCEPSS rescore
  8. 2026-07-07 13:46 UTCEPSS rescore
  9. 2026-07-06 16:27 UTCEPSS rescore
  10. 2026-07-06 16:27 UTCEPSS rescore
  11. 2026-07-06 08:11 UTCOSV refresh
  12. 2026-07-06 02:23 UTCEPSS rescore
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  20. 2026-06-30 23:22 UTCEPSS rescore
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  23. 2026-06-28 14:07 UTCEPSS rescore
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  25. 2026-06-28 04:56 UTCEPSS rescore
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  27. 2026-06-27 03:08 UTCEPSS rescore
  28. 2026-06-25 13:49 UTCEPSS rescore
  29. 2026-06-24 14:04 UTCEPSS rescore
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  31. 2026-06-23 21:32 UTCEPSS rescore
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  36. 2026-06-21 01:59 UTCEPSS rescore
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  38. 2026-06-19 19:25 UTCEPSS rescore
  39. 2026-06-19 19:25 UTCEPSS rescore
  40. 2026-06-18 17:52 UTCEPSS rescore
  41. 2026-06-18 17:52 UTCEPSS rescore
  42. 2026-06-17 20:05 UTCOSV refresh
  43. 2026-06-17 17:52 UTCEPSS rescore
  44. 2026-06-16 17:52 UTCEPSS rescore
  45. 2026-06-15 17:48 UTCEPSS rescore
  46. 2026-06-15 17:48 UTCEPSS rescore
  47. 2026-06-14 23:18 UTCEPSS rescore
  48. 2026-06-13 23:00 UTCEPSS rescore
  49. 2026-06-13 23:00 UTCEPSS rescore
  50. 2026-06-12 23:11 UTCEPSS rescore
  51. 2026-06-11 14:00 UTCEPSS rescore
  52. 2026-06-10 22:18 UTCEPSS rescore
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  54. 2026-06-10 13:22 UTCEPSS rescore
  55. 2026-06-07 15:24 UTCEPSS rescore
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  57. 2026-06-06 13:47 UTCEPSS rescore
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  59. 2026-06-05 22:46 UTCEPSS rescore
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  61. 2026-06-05 06:10 UTCEPSS rescore
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  63. 2026-06-04 13:12 UTCEPSS rescore
  64. 2026-06-04 13:12 UTCEPSS rescore
  65. 2026-06-02 20:13 UTCEPSS rescore
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  67. 2026-06-01 13:51 UTCEPSS rescore
  68. 2026-06-01 13:51 UTCEPSS rescore
  69. 2026-05-31 22:30 UTCEPSS rescore
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  71. 2026-05-31 00:16 UTCEPSS rescore
  72. 2026-05-31 00:16 UTCEPSS rescore
  73. 2026-05-29 18:01 UTCEG score recompute
  74. 2026-05-29 13:44 UTCEPSS rescore

Publicly available exploits

(3 references)

Working exploit code is in the public domain (3 Metasploit modules). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Metasploitexploit/unix/http/freepbx_firmware_file_upload✓ verified
    First seen Dec 11, 2025

    FreePBX firmware file upload

    Open source ↗
  • Metasploitexploit/unix/http/freepbx_custom_extension_rce✓ verified
    First seen Dec 11, 2025

    FreePBX endpoint SQLi to RCE

    Open source ↗
  • Metasploitauxiliary/gather/freepbx_custom_extension_injection✓ verified
    First seen Dec 11, 2025

    FreePBX Custom Extension SQL Injection

    Open source ↗

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-66039?
CVE-2025-66039 is a critical vulnerability published on December 9, 2025. FreePBX Endpoint Manager is a module for managing telephony endpoints in FreePBX systems. Versions are vulnerable to authentication bypass when the authentication type is set to "webserver." When providing an Authorization header with an arbitrary value, a session is associated with the target user…
When was CVE-2025-66039 disclosed?
CVE-2025-66039 was first published in the National Vulnerability Database on December 9, 2025, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-66039 actively exploited?
CVE-2025-66039 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3% probability of exploitation in the next 30 days, which ranks it in the top 13.6% of all scored CVEs.
What is the CVSS score of CVE-2025-66039?
CVE-2025-66039 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-66039?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-66039, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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