CVE-2025-3927
📋 TL;DR
Digigram's PYKO-OUT audio-over-IP web-server has no default password requirement, allowing unauthenticated attackers to connect and compromise the device. This affects all PYKO-OUT devices with default configurations, potentially enabling network pivoting to connected systems.
💻 Affected Systems
- Digigram PYKO-OUT audio-over-IP devices
📦 What is this software?
Pyko Out by Digigram
⚠️ Risk & Real-World Impact
Worst Case
Full device compromise leading to network pivoting, data exfiltration, and hardware manipulation of connected audio equipment.
Likely Case
Unauthorized access to device configuration, potential denial of service, and credential harvesting from connected systems.
If Mitigated
Limited to attempted connection logs if proper authentication is enforced.
🎯 Exploit Status
Exploitation requires only network access to the device's web interface with no authentication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not specified in references
Vendor Advisory: https://www.kb.cert.org/vuls/id/360686
Restart Required: No
Instructions:
1. Access device web interface. 2. Navigate to security settings. 3. Set a strong password for web access. 4. Save configuration.
🔧 Temporary Workarounds
Set Web Interface Password
allConfigure a strong password for the web-server interface to prevent unauthorized access.
Network Segmentation
allIsolate PYKO-OUT devices on separate VLANs with strict firewall rules limiting access.
🧯 If You Can't Patch
- Implement network access controls to restrict web interface access to authorized IPs only.
- Monitor network traffic to PYKO-OUT devices for unauthorized connection attempts.
🔍 How to Verify
Check if Vulnerable:
Attempt to access the device's web interface at http://[device-ip] without credentials; if access is granted, device is vulnerable.Check Version:
Check device web interface 'About' or 'System Info' page for firmware version.Verify Fix Applied:
Attempt web interface access without credentials; access should be denied or prompt for password.📡 Detection & Monitoring
Log Indicators:
- Unauthenticated web access attempts
- Configuration changes from unknown IPs
Network Indicators:
- HTTP traffic to PYKO-OUT web ports (typically 80/443) from unexpected sources
SIEM Query:
source_ip=* AND dest_port IN (80,443) AND dest_ip=[PYKO-OUT_IP] AND http_status=200 AND user_agent NOT IN (authorized_clients)