What is CVE-2021-27170?

CVE-2021-27170 is a critical-severity vulnerability in Fiberhome Hg6245d, classified under CWE-922. CVSS score: 9.8/10. Published 2021-02-10.

How severe is CVE-2021-27170?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Fiberhome Hg6245d

CVE-2021-27170

An issue was discovered on FiberHome HG6245D devices through RP2613. By default, there are no firewall rules for IPv6 connectivity, exposing the internal management interfaces to the Internet.

Published 2021-02-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.159 (96.8th percentile), scored 2026-09-29.

Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 97th percentile — 96.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.159 · newest: 0.159 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-922

References

pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-27170?: CVE-2021-27170 is a critical-severity vulnerability in Fiberhome Hg6245d, classified under CWE-922. CVSS score: 9.8/10. Published 2021-02-10.
How severe is CVE-2021-27170?: Critical severity. CVSS v3 base score is 9.8 out of 10.