D-Link Systems, Inc. - On September 8th, 2017, a news article reported zero-day flaws with D-Link DIR-850L routers. D-Link immediately took actions to investigate the issues and endeavours to find the solutions to resolve them.

Firmwares that address these vulnerabilities are now available to download from the DIR-850L product support pages or from the direct links below. Please ensure you follow the instructions provide within the firmware files.

• DIR-850L H/W vers. A
• DIR-850L H/W vers. B

You can find out the H/W (hardware) version of your DIR-850L from the device label on the bottom of the router. 

Product security and customer privacy are important concerns to D-Link. We have a Task force and a Product Management team on call to provide immediate attention to address evolving security issues and implement appropriate security measures. We strive to continuously improve the security of our products.

 
1. Reset the router to its default factory setting. 
2. Disable the WAN remote admin feature 
3. Do not remotely access the router through unauthorised public Wi-Fi.
4. Change the wireless SSID password and PIN code to prevent unauthorised users from accessing the LAN.
5. Change the device’s administrator password. Be sure to use a strong new password.