Support Announcements
DGS-3630 Series Switches :: Firmware Update with Complete RFC5961 for mitigation of CVE-2004-0230 TCP Denial of Service Vulnerability



Following the US DHS advisory about the issue: The issue was decribed by Tenable Security as: "TCP, when using a large Window Size, makes it easier for remote attackers to guess sequence numbers and cause a denial of service (connection loss) to persistent TCP connections by repeatedly injecting a TCP RST packet, especially in protocols that use long-lived connections, such as BGP."


D-Link was made aware of the reported issues, we performed an investigation. The issue was reported on the DGS-3630 series of switches and we began developing security patches.


The full mitigating solution requires full-implmentation of RFC5961 and proper implemention of it's use on the network.


The firmware below does implement mitigation features which reduces the risks, however owners and IT departments should investigate it's risks across their networks of CVE-2004-0230. The risks elevated by CVE-2004-0230 are not related to D-Link, we release this software to help mitigate it's effect on the networks our devices are connected.

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.


Report information  


         - MITRE :: CVE-2004-0230


              - Link :: 


Affected Models


Model Hardware Revision  Region Affected FW Fixed FW Recommendation  Last Updated
DGS-3630 Family
All A Hardware Revisions US v2.25.x & Below v2.28.003_Beta Hotfix
Upgrade to Hofix Patch


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.