Support Announcements
(non-US) DIR-842 :: H/W Rev. A1/A2/B1/B2 :: All Firmware Versions :: End of Support / End of Life Product :: Reported Vulnerability



The (non-US) DIR-842 hardware revision A1/A2/B1/B2 are legacy devices listed below in the table, these hardware revisions, have reached their End of Life ("EOL") /End of Service Life ("EOS") Life-Cycle on January 31, 2018.  D-Link US recommends D-Link devices that have reached EOL/EOS, to be retired and replaced. Please contact your regional office for recommendations (LINK). 


As a  general policy, when products reach EOS/EOL, they can no longer be supported, and all firmware development for these products cease.  Please read information and recommendations below.

3rd Party Report information

          huanBIn Ruan :: doudoudedi233 _at_ gmail _dot_ com


Details : Reported 01/04/2021

        DIR-842 (Rev A) and DIR-842 (Rev B) firmware , the Qrs_setFirewallRule function of the ncc2 binary service has the following view in IDA. This function is used to set the router firewall rule. This function stores the ip address range of the firewall rule to v54. The maximum length is 128 bytes, and then the ip address range will be copied to v55. The space size of v55 is 128 bytes. At this time, if you use strcpy copy and v54 is 128 bytes, the strcpy function will convert the 128 bytes of v54 Copy all to v55, and add a null byte at v55[0x81], which causes the variables next to the stack to be modified, resulting in a denial of service on the web side.


Affected Models


Model Region Hardware Revision End of Support Legacy Website Last Updated
DIR-842 All Regions All A and B Series H/W Revisions  01/31/2018 No (Non US) 01/05/22


Recommendation for End of Support /End of Life Products


From time to time, D-Link will decide that some of its products have reached End of Support ("EOS") / End of Life (“EOL”). D-Link may choose to EOS/EOL a product due to evolution of technology, market demands,  new innovations, product efficiencies based on new technologies, or the product matures over time and should be replaced by functionally superior technology.


For US Consumer


If a product has reached End of Support ("EOS") / End of Life ("EOL"), there is normally no further extended support or development for it.


Typically for these products, D-Link will be unable to resolve device or firmware issues since all development and customer support has ceased. 


D-Link strongly recommends that this product be retired and cautions that any further use of this product may be a risk to devices connected to it. If US consumers continue to use these devices against D-Link's recommendation, please make sure the device has the most recent firmware, make sure you frequently update the device's unique password to access its web-configuration, and always have WIFI encryption enabled with a unique password.