Support Announcements
(Non-US) DWR-921 :: H/W Rev. C3 :: F/W v3.0.2 & v4.0.0 :: VPN Feature using Weak Cypher Suite


On March 21, 2021, a 3rd party security researcher submitted a report accusing the DWR-921 using firmware v3.0.2 & v4.0.0 of using only known weak-cypher encryption suites in the devices VPN feature.. The Vulnerability was confirmed and a patch was issued too close the reported issue.  Please find the beta/hotfix release below.

3rd Party Report information


          - Report provided: gor Rabinovich : CEO & Founder at AKITA.CLOUD : rabiigor _at_ akita _dot_ cloud

          - Reference :

AKITA CLOUD discovered that while there are multiple options to establish a “Secure Tunnel” ( aka VPN ) the only available encryption cipher options are DES with a key size of 96bit. Although cracking DES keys previously was a manner of years or months previously today a cloud rainbow tables cracking service such as can retrieve a key in 25 seconds.


 Affected Models


Model Hardware Revision Affected FW Fixed FW Recommendation  Last Updated
DWR-921 All Cx Hardware Revisions v3.0.2 & v4.0.0 v21-0415-Hotfix-Beta Please Download and Update Device 04/22//2021


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.