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CVE-2025-66039

Sangoma Freepbx authentication bypass

9.8 CRITICALEPSS 3.28%
  1. Published9 Dec 2025

Description

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 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Sangoma Freepbx≥ 17.0.1 < 17.0.23 · < 16.0.44

Remediation

Fixed in
Sangoma Freepbx≥ 17.0.23

References

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Frequently asked

Is CVE-2025-66039 being actively exploited?

CVE-2025-66039 is not in the CISA KEV catalog. Its EPSS exploit probability is 3.28%.

How severe is CVE-2025-66039?

CVE-2025-66039 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 3.28% probability of exploitation.

Which products are affected by CVE-2025-66039?

Affected products include Sangoma Freepbx.

How do I fix CVE-2025-66039?

Upgrade affected software to a fixed version, for example Sangoma Freepbx 17.0.23 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-66039 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.