CVE-2022-27294
📋 TL;DR
This vulnerability is a stack overflow in D-Link DIR-619 Ax routers that allows attackers to cause Denial of Service (DoS) by sending specially crafted requests to the webpage parameter. It affects D-Link DIR-619 Ax v1.00 routers, potentially disrupting network connectivity for users.
💻 Affected Systems
- D-Link DIR-619 Ax
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete router crash requiring physical reboot, persistent network downtime, and potential remote code execution if combined with other vulnerabilities.
Likely Case
Router becomes unresponsive, requiring reboot to restore functionality, causing temporary network disruption.
If Mitigated
Minimal impact with proper network segmentation and access controls limiting exposure.
🎯 Exploit Status
Public proof-of-concept available in GitHub repository. Exploitation requires sending crafted HTTP request to vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Check vendor advisory for latest firmware
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-619 Ax. 3. Log into router web interface. 4. Navigate to firmware update section. 5. Upload and apply new firmware. 6. Reboot router.
🔧 Temporary Workarounds
Disable remote management
allPrevent external access to router web interface
Network segmentation
allIsolate router management interface to trusted network
🧯 If You Can't Patch
- Replace vulnerable hardware with supported model
- Implement strict firewall rules blocking access to router management interface from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check router firmware version in web interface under System > FirmwareCheck Version:
No CLI command - check via web interface at http://router-ip/System/firmware.aspVerify Fix Applied:
Verify firmware version matches latest patched version from vendor advisory📡 Detection & Monitoring
Log Indicators:
- Unusual HTTP requests to formWlanWizardSetup endpoint
- Router reboot events
- Web interface access from unusual IPs
Network Indicators:
- HTTP POST requests with large webpage parameter to router management port
- Sudden loss of router responsiveness
SIEM Query:
source="router_logs" AND (uri="*formWlanWizardSetup*" OR message="*reboot*" OR message="*crash*")