CVE-2026-4377 Use of Weak Credentials in D-Link DWR-X1820 router
Attackers can gain unauthorized access to D-Link DWR-X1820 routers by deriving the weak default password from the device's IMEI number.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-4377?
CVE-2026-4377 is a medium-severity vulnerability in D-Link Corporation DWR-X1820, published on 28 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Dlink DWR-X1820 router uses weak default password generated from its IMEI number and does not require users to change it. An attacker who knows how passwords are generated can easily crack the default password if they have the device IMEI number.
This issue was fixed in version 1.00B16CP.
Weakness: CWE-1391
Which versions are affected by CVE-2026-4377?
How do I fix CVE-2026-4377?
No fix has been published for CVE-2026-4377 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-4377 being exploited?
There is no known exploitation of CVE-2026-4377 in the wild and no public exploit code.
Sources
Also known as GHSA-624f-p4gg-qwg2.