CVE-2021-34204
MediumCVSS 6.8Exploitation Probability (EPSS)
Elevated risk62th percentile - higher than 62% of all known CVEs
Summary
D-Link DIR-2640-US router version 1.01B04 stores the system account password in plain text. It does not use Linux user management, and all devices share the same unchangeable password. An attacker can easily log in via the serial port and gain root privileges.
Risk Assessment
The organization risks complete compromise of the router, allowing an attacker to access the internal network, intercept traffic, or modify device configuration.
Recommendation
Immediately update the router firmware to the latest version or replace the device with a non-vulnerable model. If an update is unavailable, restrict physical access to the serial port.
Original NVD description (English source)
D-Link DIR-2640-US 1.01B04 is affected by Insufficiently Protected Credentials. D-Link AC2600(DIR-2640) stores the device system account password in plain text. It does not use linux user management. In addition, the passwords of all devices are the same, and they cannot be modified by normal users. An attacker can easily log in to the target router through the serial port and obtain root privileges.