CVE-2021-27173: Fiberhome HG6245D Firmware

High severity, CVSS 7.5. EPSS: 12.7% chance of exploitation in the next 30 days.

An issue was discovered on FiberHome HG6245D devices through RP2613. There is a telnet?enable=0&key=calculated(BR0_MAC) backdoor API, without authentication, provided by the HTTP server. This will remove firewall rules and allow an attacker to reach the telnet server (used for the CLI).

Affected products

• Fiberhome HG6245D Firmware: up to and including rp2613

Published 2021-02-10. Last modified 2026-06-17.