CVE-2021-27177
CRITICALCVSS 9.8/10EPSS 19.73%
Last modified
CVE-2021-27177 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to bypass authentication by sending the decoded value of the GgpoZWxwCmxpc3QKd2hvCg== string to the telnet server.. EPSS estimates a 19.73% chance of exploitation in the next 30 days.
Description
An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to bypass authentication by sending the decoded value of the GgpoZWxwCmxpc3QKd2hvCg== string to the telnet server.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fiberhome | Hg6245d Firmware | <= rp2613 |
References
- https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-cli-auth-bypassExploit, Third Party Advisory
- https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-cli-auth-bypassExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2021-27177?
An issue was discovered on FiberHome HG6245D devices through RP2613. It is possible to bypass authentication by sending the decoded value of the GgpoZWxwCmxpc3QKd2hvCg== string to the telnet server.
How severe is CVE-2021-27177?
CVE-2021-27177 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 19.73% probability of exploitation in the next 30 days.
How do I fix CVE-2021-27177?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2021-27177?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST