CVE-2026-4346

Medium

Description

The vulnerability affecting TL-WR850N v3 allows cleartext storage of administrative and Wi-Fi credentials in a region of the device’s flash memory while the serial interface remains enabled and protected by weak authentication. An attacker with physical access and the ability to connect to the serial port can recover sensitive information, including the router’s management password and wireless network key. Successful exploitation can lead to full administrative control of the device and unauthorized access to the associated wireless network.

SeverityMedium

CVSS6.8

Exploit probability—

Product

Tp-link Tl-wr850n Firmware

PublishedMar 26, 2026

First seenMar 26, 2026

Weakness typeCWE-312CWE-312

How to fix

Update

tp-link tl-wr850n_firmware0.9.1_Build251205 or later

Patches

tp-link.com/in/support/download/tl-wr850n/#Firmware

Vendor advisories

tp-link.com/us/support/faq/5034/

Affected products

Product	Affected versions	Fixed in
tp-link tl-wr850n_firmware	v < 0.9.1_Build251205	0.9.1_Build251205

Check your version

Choose the product and enter the version you run to see whether it falls in the affected range.

In the Intelligence 360 plan

Attack Surface Management

See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.