CVE-2021-44827: TP-Link Archer c20i Firmware

High severity, CVSS 8.8. EPSS: 54% chance of exploitation in the next 30 days.

There is remote authenticated OS command injection on TP-Link Archer C20i 0.9.1 3.2 v003a.0 Build 170221 Rel.55462n devices vie the X_TP_ExternalIPv6Address HTTP parameter, allowing a remote attacker to run arbitrary commands on the router with root privileges.

Affected products

• TP-Link Archer c20i Firmware: up to and including 170221

Published 2022-03-04. Last modified 2026-06-17.