D-Link Routers: memory corruption flaw under attack

What is affected

D-Link Routers are the kind of equipment many homes and small offices run for years without touching: a router, camera or storage box. Attackers scan the internet for exposed units, and a hijacked one can spy on traffic or be enrolled in a botnet without any visible sign.

D-Link Routers contains a buffer overflow vulnerability that has a high impact on confidentiality, integrity, and availability. The impacted products could be end-of-life (EoL) and/or end-of-service (EoS). Users should discontinue product utilization.

What an attacker can do

This is a memory corruption flaw. It lets an attacker corrupt the program's memory by feeding it specially crafted content: a web page, a file or a network message. The result ranges from a crash to the attacker running their own code.

How it is reached

Over the internet or network

Access the attacker needs

No account needed

Does the victim have to do something?

No, works without the victim doing anything

What to do

1. Check whether you own this device: look at the label on your router, camera or NAS, or open its admin page and note the model and firmware version.
2. Install the latest firmware from the manufacturer's support page or the device's own update menu.
3. If the manufacturer no longer releases updates for the model, replace it. An end-of-life device with an exploited flaw cannot be made safe.
4. Turn off remote administration from the internet unless you truly need it, and change the default admin password.

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Vendor advisories and fixes

• supportannouncement.us.dlink.comsupportannouncement.us.dlink.com/security/publication.aspx?name=SAP10308

How urgent is it

CISA added this vulnerability to its Known Exploited Vulnerabilities catalogue on December 8, 2025, which means there is reliable evidence of attacks in the wild. US federal agencies must fix it by December 29, 2025, a deadline that has already passed. That deadline does not bind anyone else, but it shows how seriously the agency rates it.

The EPSS model estimates a 56% probability that this flaw will be exploited somewhere in the next 30 days. That is higher than 99.0% of all scored vulnerabilities.

Its CVSS severity score is 9.8 out of 10 (critical), as recorded in the US National Vulnerability Database.

Technical description

D-Link Go-RT-AC750 GORTAC750_revA_v101b03 and GO-RT-AC750_revB_FWv200b02 are vulnerable to Buffer Overflow via cgibin, hnap_main,