CVE-2021-27141

Name: CVE-2021-27141
Creator: NVD / NIST
Published: 2021-02-10T19:15:12.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 15.80%

Last modified Jun 17, 2026

CVE-2021-27141 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. An issue was discovered on FiberHome HG6245D devices through RP2613. Credentials in /fhconf/umconfig.txt are obfuscated via XOR with the hardcoded *j7a(L#yZ98sSd5HfSgGjMj8;Ss;d)(*&^#@$a2s0i3g key. EPSS estimates a 15.80% chance of exploitation in the next 30 days.

Description

An issue was discovered on FiberHome HG6245D devices through RP2613. Credentials in /fhconf/umconfig.txt are obfuscated via XOR with the hardcoded *j7a(L#yZ98sSd5HfSgGjMj8;Ss;d)(*&^#@$a2s0i3g key. (The webs binary has details on how XOR is used.)

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

15.80%

96.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-798

Affected Software

Vendor	Product	Versions
Fiberhome	Hg6245d Firmware	<= rp2613

References

https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-decryption-algorithmExploit, Third Party Advisory
https://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#httpd-decryption-algorithmExploit, Third Party Advisory

Timeline

Published: Feb 10, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-27141?

How severe is CVE-2021-27141?

CVE-2021-27141 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 15.80% probability of exploitation in the next 30 days.

How do I fix CVE-2021-27141?

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-2021-27141?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST