CVE-2025-13548
📋 TL;DR
A buffer overflow vulnerability in D-Link DIR-822K and DWR-M920 routers allows remote attackers to execute arbitrary code by manipulating the submit-url parameter in the /boafrm/formFirewallAdv endpoint. This affects users running vulnerable firmware versions, potentially leading to complete device compromise. The vulnerability is remotely exploitable without authentication.
💻 Affected Systems
- D-Link DIR-822K
- D-Link DWR-M920
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full device takeover, creation of persistent backdoors, lateral movement into internal networks, and data exfiltration.
Likely Case
Device compromise allowing attackers to modify router settings, intercept network traffic, and use the device as a pivot point for further attacks.
If Mitigated
Limited impact if devices are behind firewalls with strict inbound filtering, though internal network exposure remains a concern.
🎯 Exploit Status
Exploit details are publicly available on GitHub, making weaponization likely. The buffer overflow appears straightforward to exploit.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None known at this time
Restart Required: Yes
Instructions:
1. Check D-Link's security advisory page for updates. 2. If a patch is released, download the firmware from D-Link's support site. 3. Upload the firmware through the router's web interface. 4. Reboot the router after installation.
🔧 Temporary Workarounds
Disable WAN access to admin interface
allPrevent remote exploitation by disabling external access to the router's management interface.
Access router web interface -> Security -> Remote Management -> Disable
Implement network segmentation
allIsolate affected routers from critical internal networks to limit lateral movement.
🧯 If You Can't Patch
- Immediately disconnect affected devices from the internet and place them behind a firewall with strict inbound rules.
- Replace affected devices with patched or alternative models if no fix becomes available.
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface: System -> Firmware Information. If version matches affected range, device is vulnerable.Check Version:
curl -s http://router-ip/boafrm/formSysCmd | grep version (if accessible)Verify Fix Applied:
After patching, verify firmware version has changed from the vulnerable version. Test the /boafrm/formFirewallAdv endpoint with controlled payloads if possible.📡 Detection & Monitoring
Log Indicators:
- Unusual POST requests to /boafrm/formFirewallAdv with long submit-url parameters
- Router reboot events or configuration changes from unknown sources
Network Indicators:
- Unexpected outbound connections from router to suspicious IPs
- Traffic patterns indicating router compromise (e.g., scanning behavior)
SIEM Query:
source="router_logs" AND uri="/boafrm/formFirewallAdv" AND (submit-url.length > 100 OR status=500)🔗 References
- https://github.com/QIU-DIE/CVE/issues/31
- https://github.com/QIU-DIE/CVE/issues/43
- https://vuldb.com/?ctiid.333315
- https://vuldb.com/?id.333315
- https://vuldb.com/?submit.693767
- https://vuldb.com/?submit.695433
- https://www.dlink.com/
- https://github.com/QIU-DIE/CVE/issues/31
- https://github.com/QIU-DIE/CVE/issues/43
