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Fencer Intel
critical 9.8

CVE-2021-27166 in the critical feed json

An issue was discovered on FiberHome HG6245D devices through RP2613.

published 5y ago modified 4mo ago also EUVD-2021-13933

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
19.6%
EPSS 19.6% chance of exploitation in 30 days, percentile 97%
public exploits
0
none known

Summary

An issue was discovered on FiberHome HG6245D devices through RP2613. The password for the enable command is gpon.

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Exploit prediction

19.56% chance of exploitation in the next 30 days, higher than 97% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • pierrekim.github.io https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-linux-hardcoded-credentials referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness
  • CWE-798 Use of Hard-coded Credentials

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.