CVE-2025-25894
📋 TL;DR
This CVE describes an OS command injection vulnerability in D-Link DSL-3782 routers via the samba_wg and samba_nbn parameters. Attackers can execute arbitrary operating system commands by sending specially crafted packets to vulnerable devices. This affects users of D-Link DSL-3782 routers running vulnerable firmware versions.
💻 Affected Systems
- D-Link DSL-3782
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router allowing attackers to install persistent backdoors, intercept network traffic, pivot to internal networks, or use the device as part of a botnet.
Likely Case
Router compromise leading to credential theft, network reconnaissance, and potential lateral movement to connected devices.
If Mitigated
Limited impact if proper network segmentation and access controls prevent external exploitation attempts.
🎯 Exploit Status
Exploitation requires crafting specific packets targeting the vulnerable parameters. No public exploit code is currently available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link support for latest firmware
Vendor Advisory: Not provided in references
Restart Required: Yes
Instructions:
1. Visit D-Link support website. 2. Download latest firmware for DSL-3782. 3. Access router admin interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable Samba Service
allDisable the Samba file sharing service if not required
Access router admin interface
Navigate to Samba/File Sharing settings
Disable Samba service
Restrict Management Access
allLimit access to router management interface
Configure firewall rules to restrict access to router admin interface
Use strong authentication if available
🧯 If You Can't Patch
- Segment network to isolate vulnerable routers from critical systems
- Implement strict network monitoring for suspicious traffic to/from router
🔍 How to Verify
Check if Vulnerable:
Check firmware version in router admin interface under System Status or Firmware Update sectionCheck Version:
Login to router admin interface and check firmware version in system informationVerify Fix Applied:
Verify firmware version has been updated to latest available from D-Link📡 Detection & Monitoring
Log Indicators:
- Unusual Samba-related log entries
- Failed authentication attempts to router admin interface
- Unexpected configuration changes
Network Indicators:
- Unusual outbound connections from router
- Suspicious packets to router Samba ports
- Anomalous traffic patterns from router
SIEM Query:
source="router_logs" AND (event="samba" OR event="configuration_change")