What is CVE-2021-41946?

CVE-2021-41946 is a medium-severity vulnerability in Fiberhome Hg150-Ub, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-05-18.

How severe is CVE-2021-41946?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2021-41946 known to be exploited?

8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Fiberhome Hg150-Ub

CVE-2021-41946

In FiberHome VDSL2 Modem HG150-Ub_V3.0, a stored cross-site scripting (XSS) vulnerability in Parental Control --> Access Time Restriction --> Username field, a user cannot delete the rule due to the XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2022-05-18 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.025 (84.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 84.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.027 · newest: 0.025 · change: -0.003

Affected products

Fiberhome Hg150-Ub
Fiberhome Hg150-Ub Firmware — versions 3.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

www.fiberhome.com/ (Vendor Advisory)
github.com/afaq1337/CVE-2021-41946 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-41946?: CVE-2021-41946 is a medium-severity vulnerability in Fiberhome Hg150-Ub, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2022-05-18.
How severe is CVE-2021-41946?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2021-41946 known to be exploited?: 8 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.