CVE-2021-27173

Public Exploit

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).

7.5

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 0.07%

Third-Party Advisory github.io

Affected: n/a n/a

References

Link	Tags
https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-infoleak	third party advisory exploit

Frequently Asked Questions

What is the severity of CVE-2021-27173?: CVE-2021-27173 has been scored as a high severity vulnerability.
How to fix CVE-2021-27173?: To fix CVE-2021-27173, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-27173 being actively exploited in the wild?: It is possible that CVE-2021-27173 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.

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