CVE-2025-57819 — Critical FreePBX Zero-Day Exploitation in the Wild

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CVE-2025-57819 is an actively exploited FreePBX zero-day vulnerability that allows unauthenticated attackers to bypass authentication, inject SQL, and achieve remote code execution (RCE).

Impact & Risks

Versions affected: FreePBX 15 <15.0.66, 16 <16.0.89, 17 <17.0.3
CVSS 3.x: 9.8 Critical | CVSS 4.0: 10.0 Critical
Attackers are exploiting this to:
- Gain full system compromise
- Install malware/backdoors
- Conduct toll fraud & call interception
- Pivot into enterprise networks

CISA has added this CVE to the KEV catalog. Federal agencies must patch by September 19, 2025.

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Indicators of Compromise (IoCs)

Modified /etc/freepbx.conf
Suspicious file /var/www/html/.clean.sh
POST requests to modular.php
Unusual call activity on extension 9998
Rogue users in ampusers DB

Mitigation Steps

Patch immediately to fixed versions (15.0.66, 16.0.89, 17.0.3).
Restrict admin panel access to trusted IPs.
Audit logs & configs for IoCs.
If compromised → rebuild from clean backups, rotate all credentials, and review call logs.

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