CVE-2025-52079
📋 TL;DR
CVE-2025-52079 allows unauthenticated attackers to change the administrator password on D-Link DIR-820L routers via a crafted POST request to /get_set.ccp. This vulnerability affects all users of the affected router version who haven't applied patches or workarounds, enabling complete device takeover.
💻 Affected Systems
- D-Link DIR-820L
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router compromise allowing attacker to change all settings, intercept network traffic, deploy malware to connected devices, and use the router as a pivot point for further attacks.
Likely Case
Attacker changes admin password, locks legitimate administrator out, and reconfigures router for malicious purposes like DNS hijacking or traffic interception.
If Mitigated
If proper network segmentation and access controls are in place, impact is limited to the router itself without lateral movement to other systems.
🎯 Exploit Status
Exploit requires sending a single crafted HTTP POST request to the vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check D-Link advisory for latest patched version
Vendor Advisory: https://www.dlink.com/en/security-bulletin/
Restart Required: Yes
Instructions:
1. Visit D-Link support site 2. Download latest firmware for DIR-820L 3. Log into router admin panel 4. Navigate to firmware update section 5. Upload and apply new firmware 6. Router will restart automatically
🔧 Temporary Workarounds
Disable Remote Management
allPrevents external attackers from accessing the vulnerable endpoint
Log into router admin → System → Remote Management → Disable
Network Segmentation
allIsolate router management interface from untrusted networks
Configure firewall rules to restrict access to router IP on port 80/443
🧯 If You Can't Patch
- Replace the router with a different model that doesn't have this vulnerability
- Place router behind a firewall that blocks all access to its web management interface
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in admin panel under System → FirmwareCheck Version:
curl -s http://router-ip/get_set.ccp | grep -i version OR check web interfaceVerify Fix Applied:
Verify firmware version is updated beyond 1.06B02 and test that POST requests to /get_set.ccp no longer allow password changes📡 Detection & Monitoring
Log Indicators:
- POST requests to /get_set.ccp with password change parameters
- Failed login attempts followed by successful login from new IP
Network Indicators:
- HTTP POST to /get_set.ccp with suspicious parameters
- Unusual traffic patterns from router to external IPs
SIEM Query:
source="router_logs" AND (uri_path="/get_set.ccp" OR action="password_change")