CVE-2021-41946: In FiberHome VDSL2 Modem HG150-Ub_V3.0, a stored cross-site scripting (XSS) vulnerability in Parental Control

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MEDIUM 5.4MITIGATE

CVE-2021-41946 is a medium-severity flaw (CVSS 5.4) affecting hg150-ub firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	3.0% (top 13%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-05-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: fiberhome

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-05-18 11:15 UTCPublished CVE record published
2026-06-17 04:09 UTCUpdated Record last modified

fiberhome hg150-ub firmware MITIGATE

Affected: 3.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-41946?

hg150-ub firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-41946 being exploited?

CVE-2021-41946 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-41946 affect?

CVE-2021-41946 affects hg150-ub firmware. Severity is medium (CVSS 5.4). 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.

How urgent is CVE-2021-41946?

Priority 46/100. Public exploit reference

Related CVEs

CVE-2022-36200 HIGH 7.5 MITIGATE In FiberHome VDSL2 Modem HG150-Ub_V3.0, Credentials of Admin are submitted in URL, which can be logged/sniffed
CVE-2021-35296 CRITICAL 9.8 MITIGATE An issue in the administrator authentication panel of PTCL HG150-Ub v3.0 allows attackers to bypass authentica

References

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