CVE-2025-45784
📋 TL;DR
D-Link DPH-400S/SE VoIP phones contain hardcoded provisioning credentials in their firmware, allowing attackers who obtain the firmware image to extract sensitive passwords. This could lead to unauthorized access to device functions or user accounts. All users of affected D-Link VoIP phones are vulnerable.
💻 Affected Systems
- D-Link DPH-400S
- D-Link DPH-400SE
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain full administrative control over VoIP phones, intercept calls, modify configurations, or use devices as entry points into corporate networks.
Likely Case
Attackers extract credentials from publicly available firmware images and use them to compromise vulnerable devices on accessible networks.
If Mitigated
With proper network segmentation and access controls, impact is limited to isolated VoIP network segments.
🎯 Exploit Status
Exploitation requires firmware access but uses basic static analysis tools like strings or hex editors.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: No
Instructions:
No official patch available. Monitor vendor advisory for firmware updates.
🔧 Temporary Workarounds
Network Segmentation
allIsolate VoIP phones on separate VLAN with strict firewall rules
Access Control Lists
allImplement ACLs to restrict management access to authorized IPs only
🧯 If You Can't Patch
- Replace affected devices with models from different vendors
- Implement network monitoring for unusual VoIP traffic patterns
🔍 How to Verify
Check if Vulnerable:
Check device firmware version via web interface or console. If version is v1.01, device is vulnerable.Check Version:
Check device web interface at http://[device-ip]/ or use console connectionVerify Fix Applied:
No fix available to verify. Monitor vendor for firmware updates.📡 Detection & Monitoring
Log Indicators:
- Failed authentication attempts followed by successful logins from unusual IPs
- Configuration changes from unauthorized sources
Network Indicators:
- Unusual management traffic to VoIP devices
- Traffic from VoIP phones to unexpected destinations
SIEM Query:
source="voip-devices" AND (event_type="auth_failure" OR event_type="config_change")