Actively Exploited — CISA KEV

CVE-2019-19006: Sangoma FreePBX Critical Vulnerability

Severity: Critical | CVSS 3.1: 9.8 | Published: 2019-11-21 | KEV Added: 2026-02-03

What is CVE-2019-19006?

Sangoma FreePBX 115.0.16.26 and below, 14.0.13.11 and below, 13.0.197.13 and below have Incorrect Access Control.

Technical Analysis

Weakness Classification

This vulnerability is classified as CWE-287 — Improper Authentication. The authentication mechanism can be bypassed or is implemented incorrectly, allowing unauthorized access.

Attack Vector Breakdown

  • Attack Vector: Network
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
  • Confidentiality: High
  • Integrity: High
  • Availability: High

Impact Analysis

This vulnerability is exploitable over the network, meaning any system reachable via the internet or internal network is potentially at risk without physical access. The attack complexity is low, requires no special privileges, and needs no user interaction — making it straightforward to exploit at scale. Successful exploitation can result in full confidentiality breach (complete data disclosure), complete integrity compromise (data modification or code execution), total availability loss (denial of service). The authentication mechanism can be bypassed or is implemented incorrectly, allowing unauthorized access.

Exploitation Probability (EPSS): 21.6% chance of exploitation in the next 30 days (96th percentile). This is a significantly elevated exploitation probability — prioritize patching.

Is CVE-2019-19006 being exploited?

Yes. CVE-2019-19006 is listed in CISA's Known Exploited Vulnerabilities (KEV) catalog, restricted to CVEs with confirmed active exploitation in the wild. CISA added this vulnerability on 2026-02-03. Inclusion in KEV triggers the patching mandate under BOD 22-01 for U.S. federal civilian agencies, with a remediation deadline of 2026-02-24.

How to fix CVE-2019-19006

Apply the security update issued by Sangoma for FreePBX. If an immediate patch is not possible, consult the vendor advisory for mitigation guidance, restrict network exposure of the affected service, and monitor logs for indicators of exploitation. CISA's Known Exploited Vulnerabilities catalog requires U.S. federal agencies to remediate this vulnerability by the due date shown below under Binding Operational Directive 22-01. Private organizations should treat KEV entries as priority-one patches because active exploitation has been confirmed in the wild.

Related Vulnerabilities

Other actively exploited vulnerabilities affecting FreePBX or sharing the same weakness (CWE-287):

  • CVE-2025-64328 (High 7.2) [same product] — FreePBX Endpoint Manager is a module for managing telephony endpoints in…
  • CVE-2025-57819 (Unknown N/A) [same product] — Sangoma FreePBX contains an authentication bypass vulnerability due to…
  • CVE-2022-0492 (High 7.8) [same CWE] — A vulnerability was found in the Linux kernel’s cgroup_release_agent_write in…
  • CVE-2026-20182 (Critical 10.0) [same CWE] — May 2026: This security advisory provides the details and fix information for…
  • CVE-2023-27351 (High 7.5) [same CWE] — This vulnerability allows remote attackers to bypass authentication on…

Frequently asked questions

Is CVE-2019-19006 critical?

CVE-2019-19006 has a CVSS 3.1 base score of 9.8 — Critical severity. It should be treated as a priority patch, especially given the active exploitation confirmed by CISA.

Is CVE-2019-19006 being actively exploited?

Yes — CISA added CVE-2019-19006 to the Known Exploited Vulnerabilities catalog on 2026-02-03. Inclusion in KEV means CISA has confirmed in-the-wild exploitation.

How do I patch CVE-2019-19006?

Apply the security update from Sangoma for FreePBX. Federal agencies must remediate by 2026-02-24 under BOD 22-01.

What type of vulnerability is CVE-2019-19006?

CVE-2019-19006 is classified under CWE-287 (Improper Authentication). The authentication mechanism can be bypassed or is implemented incorrectly, allowing unauthorized access.

What is the CVSS score for CVE-2019-19006?

CVE-2019-19006 has a CVSS 3.1 base score of 9.8, classifying it as Critical severity. The attack vector is Network, attack complexity is Low, and no privileges are required.