CVE-2021-41653: TP-Link Tl-WR840N Firmware

Critical severity, CVSS 9.8. EPSS: 76% chance of exploitation in the next 30 days.

The PING function on the TP-Link TL-WR840N EU v5 router with firmware through TL-WR840N(EU)_V5_171211 is vulnerable to remote code execution via a crafted payload in an IP address input field.

Affected products

• TP-Link Tl-WR840N Firmware: up to and including tl-wr840n\(eu\)_v5_171211

Published 2021-11-13. Last modified 2026-07-09.