What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-26 · updated 2026-06-17
• Weakness: CWE-312

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.

Affected products

• TP-Link Systems Inc. TL-WR850N v3: before 0.9.1_Build251205 — fixed in 0.9.1_Build251205

How to fix

Upgrade to a fixed version: TP-Link Systems Inc. TL-WR850N v3 0.9.1_Build251205. Check the vendor advisory for mitigations.

References

• https://www.tp-link.com/in/support/download/tl-wr850n/#Firmware
• https://www.tp-link.com/us/support/faq/5034/

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