CVE-2021-27173
CVSS v3
7.5
HIGH
EPSS Score
12.7 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
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).
Technical details
- Published
- 2021-02-10
Frequently asked questions
What is CVE-2021-27173?
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).
Is CVE-2021-27173 actively exploited?
Active exploitation of CVE-2021-27173 has not been confirmed. Its EPSS score was 12.7% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-27173?
CVE-2021-27173 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-27173 affecting your environment?
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