What’s Vulnerable › Vulnerabilities

CVE-2021-27165

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 19.8% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-10 · updated 2026-06-17
• Weakness: CWE-798

Description

An issue was discovered on FiberHome HG6245D devices through RP2613. The telnet daemon on port 23/tcp can be abused with the gpon/gpon credentials.

Affected products

• FiberHome Hg6245D Firmware: through rp2613

References

• https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-linux-hardcoded-credentials
• https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-linux-hardcoded-credentials

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