DIR-878 and DIR-882: CVE-2020-8863 Authentication Bypass & CVE-2020-8864 Unauthenticated Bypass

26 február, 2020


On December 23, 2019, Trend Micro's Zero Day Initiative (ZDI) research team submitted two security-related issues (1) 
CVE-2020-8863 (ZDI ID: ZDI-CAN-9470) an HNAP PrivateLogin Incorrect Implementation of Authentication Algorithm Authentication Bypass vulnerability and (2) CVE-2020-8864 (ZDI ID: ZDI-CAN-9471) an HNAP strncmp Incorrect Comparison Authentication Bypass vulnerability. These vulnerabilities are  logic flaws in the implementation of the HNAP allowing an LAN-Side attacker to bypass authentication and reset the admin password

D-Link takes the issues of network security and user privacy very seriously. We have a dedicated task force and product management team on call to address evolving security issues and implement appropriate security measures.


3rd Party Report information

          - Report provided
 by chung96vn - Security Researcher of VinCSS (Member of Vingroup) working with Trend Micro ZDI

          - Reference :

            - CVE-2020-8863 :: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8863

               -  ZDI-CAN-9470: D-Link Routers HNAP PrivateLogin Incorrect Implementation of Authentication Algorithm Authentication Bypass Vulnerability


             - CVE-2020-8864 :: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-8864

                - ZDI-CAN-9471: D-Link Multiple Routers HNAP strncmp Incorrect Comparison Authentication Bypass Vulnerability


 Affected Models



Hardware Revision

Affected FW

Fixed FW


Last Updated


All Ax Hardware Revisions

v1.20b03_Hotfix & Below


Beta Patch



All Ax Hardware Revisions

v1.10b04 & Below


Beta Patch


*For other models that are not available in the European region, please refer to your local D-Link website for more information. 


Regarding Security patch for your D-Link Devices

Firmware updates address the security vulnerabilities in affected D-Link devices. D-Link will update this continually and we strongly recommend all users to install the relevant updates.

Please note that this is a device beta software, beta firmware, or hot-fix release which is still undergoing final testing before its official release. The beta software, beta firmware, or hot-fix is provided on an “as is” and “as available” basis and the user assumes all risk and liability for use thereof. D-Link does not provide any warranties, whether express or implied, as to the suitability or usability of the beta firmware. D-Link will not be liable for any loss, whether such loss is direct, indirect, special or consequential, suffered by any party as a result of their use of the beta firmware.

As there are different hardware revisions on our products, please check this on your device before downloading the correct corresponding firmware update. The hardware revision information can usually be found on the product label on the underside of the product next to the serial number. Alternatively, they can also be found on the device web configuration.