CVE-2025-9769
📋 TL;DR
This CVE describes a command injection vulnerability in D-Link DI-7400G+ routers that allows attackers to execute arbitrary commands on the device. The vulnerability affects the management interface and requires physical access to exploit. Organizations using these routers in their networks are at risk.
💻 Affected Systems
- D-Link DI-7400G+
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete device compromise allowing persistent backdoor installation, network traffic interception, and lateral movement to connected systems.
Likely Case
Local attacker gains administrative control of the router, enabling network disruption, credential theft, and man-in-the-middle attacks.
If Mitigated
Limited impact due to physical access requirement and network segmentation preventing lateral movement.
🎯 Exploit Status
Proof-of-concept exploit code is publicly available on GitHub. Exploitation requires physical access to the device.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: UNKNOWN
Vendor Advisory: NONE
Restart Required: No
Instructions:
Check D-Link security advisories for firmware updates. If available, download from official D-Link support site and follow firmware upgrade instructions.
🔧 Temporary Workarounds
Physical Security Controls
allRestrict physical access to network equipment to authorized personnel only
Network Segmentation
allIsolate vulnerable devices in separate network segments to limit potential lateral movement
🧯 If You Can't Patch
- Decommission and replace affected devices with supported models
- Implement strict physical access controls and surveillance for network equipment rooms
🔍 How to Verify
Check if Vulnerable:
Check firmware version via web interface: Login > System > Firmware Information. If version is 19.12.25A1, device is vulnerable.Check Version:
Check via web interface or SSH if enabled: show version or cat /proc/versionVerify Fix Applied:
After firmware update, verify version is no longer 19.12.25A1. Check D-Link advisories for specific patched version.📡 Detection & Monitoring
Log Indicators:
- Unusual command execution in system logs
- Multiple failed login attempts followed by successful access
- Unexpected firmware or configuration changes
Network Indicators:
- Unusual outbound connections from router
- DNS or routing configuration changes
- New administrative users or services
SIEM Query:
source="router_logs" AND (command="*echo*" OR command="*sh*" OR command="*bash*")🔗 References
- https://github.com/xyh4ck/iot_poc
- https://github.com/xyh4ck/iot_poc#vulnerability-verification-process
- https://vuldb.com/?ctiid.322069
- https://vuldb.com/?id.322069
- https://vuldb.com/?submit.640779
- https://www.dlink.com/
- https://github.com/xyh4ck/iot_poc
- https://github.com/xyh4ck/iot_poc#vulnerability-verification-process
