CVE-2025-69542
📋 TL;DR
A command injection vulnerability in D-Link DIR895LA1 routers allows attackers to execute arbitrary commands with root privileges by sending malicious DHCP hostnames during lease renewal. This affects all users of DIR895LA1 firmware version v102b07. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- D-Link DIR895LA1
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the router with root access, allowing installation of persistent malware, network traffic interception, credential theft, and pivoting to internal networks.
Likely Case
Router takeover leading to DNS hijacking, credential harvesting, and deployment of botnet malware.
If Mitigated
Limited impact if network segmentation isolates the router and external DHCP requests are blocked.
🎯 Exploit Status
The vulnerability is trivial to exploit with publicly available technical details. No authentication required.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available at this time
Restart Required: Yes
Instructions:
1. Check D-Link security advisories for patch availability. 2. If patch exists, download from D-Link support portal. 3. Upload firmware via router web interface. 4. Reboot router after update.
🔧 Temporary Workarounds
Disable DHCP Server
allUse external DHCP server or static IP assignments to avoid vulnerable DHCP service.
Network Segmentation
allIsolate router management interface and restrict DHCP client access to trusted devices only.
🧯 If You Can't Patch
- Replace affected hardware with supported/patched alternative
- Implement strict network access controls and monitor for exploitation attempts
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: System > Firmware. If version is v102b07, device is vulnerable.Check Version:
No CLI command available. Use web interface at http://router_ip/System/Firmware.htmlVerify Fix Applied:
After patching, verify firmware version shows newer than v102b07. Test with controlled DHCP hostname injection attempt.📡 Detection & Monitoring
Log Indicators:
- Unusual DHCP hostnames containing shell metacharacters
- Unexpected processes spawned from dhcpd service
Network Indicators:
- DHCP requests with suspicious hostname patterns
- Outbound connections from router to unexpected destinations
SIEM Query:
source="router_logs" AND (hostname="*;*" OR hostname="*`*" OR hostname="*$(*" OR hostname="*||*")