CVE-2026-4346 MEDIUM

CVE-2026-4346: Cleartext Storage of Administrative and Wi-Fi Credentials via Accessible Serial Interface in TP Link's TL-WR850N

Vendor Tp-Link Systems Inc.
Product TL-WR850N v3
Weakness CWE-312 · Cleartext storage
Published March 26, 2026
Last update March 27, 2026

CVSS base score

5.1/10
Attack vector Physical
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:P/AC:L/AT:N/PR:H/UI:N/VC:H/VI:N/VA:N/SC:L/SI:N/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 26, 2026 CVE published
March 27, 2026 Record updated