CVE-2021-41427: Beeline Smart Box 2.0.38 is vulnerable to Cross Site Scripting (XSS) via the choose_mac parameter to setup.cgi

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MEDIUM 6.1MITIGATE

CVE-2021-41427 is a medium-severity flaw (CVSS 6.1) affecting smart box firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Beeline Smart Box 2.0.38 is vulnerable to Cross Site Scripting (XSS) via the choose_mac parameter to setup.cgi.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	1.1% (top 35%)
CISA exploited list	No
Weakness	CWE-79
Published	2021-11-10
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: beeline

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

Am I affected?

Timeline

2021-11-10 16:15 UTCPublished CVE record published
2026-06-17 04:08 UTCUpdated Record last modified

beeline smart box firmware MITIGATE

Affected: 2.0.38

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.38

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-2021-41427?

smart box firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-41427 being exploited?

CVE-2021-41427 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-2021-41427 affect?

CVE-2021-41427 affects smart box firmware. Severity is medium (CVSS 6.1). Beeline Smart Box 2.0.38 is vulnerable to Cross Site Scripting (XSS) via the choose_mac parameter to setup.cgi.

How urgent is CVE-2021-41427?

Priority 43/100. Public exploit reference

Related CVEs

CVE-2021-41426 HIGH 8.8 MITIGATE Beeline Smart box 2.0.38 is vulnerable to Cross Site Request Forgery (CSRF) via mgt_end_user.htm.
CVE-2020-12246 HIGH 8.8 MITIGATE Beeline Smart Box 2.0.38 routers allow "Advanced settings > Other > Diagnostics" OS command injection via the

References

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