What’s Vulnerable › Vulnerabilities

CVE-2021-27173

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 12.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-10 · updated 2026-06-17

Description

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: through rp2613

References

• https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak
• https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak

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