CVE-2024-39363: A cross-site scripting (xss) vulnerability exists in the login.cgi set_lang_CountryCode() functionality of Wav

This week

CRITICAL 9.6MITIGATE

CVE-2024-39363 is a critical-severity flaw (CVSS 9.6) affecting wl-wn533a8 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A cross-site scripting (xss) vulnerability exists in the login.cgi set_lang_CountryCode() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to a disclosure of sensitive information. An attacker can make an unauthenticated HTTP request to trigger this vulnerability.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	49.0% (top 1%)
CISA exploited list	No
Weakness	CWE-80
Published	2025-01-14
Last modified	2026-06-17

Publisher (CNA): Talos · Vendor: wavlink

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

Am I affected?

Timeline

2025-01-14 15:15 UTCPublished CVE record published
2026-06-17 07:41 UTCUpdated Record last modified

wavlink wl-wn533a8 firmware MITIGATE

Affected: m33a8.v5030.210505

Fixed in: no fixed release known

Safe to downgrade to: a release before m33a8.v5030.210505

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-2024-39363?

wl-wn533a8 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-39363 being exploited?

CVE-2024-39363 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-2024-39363 affect?

CVE-2024-39363 affects wl-wn533a8 firmware. Severity is critical (CVSS 9.6). A cross-site scripting (xss) vulnerability exists in the login.cgi set_lang_CountryCode() functionality of Wavlink AC3000 M33A8.V5030.210505. A specially crafted HTTP request can lead to a disclosure of sensitive information. An attacker ca

How urgent is CVE-2024-39363?

Priority 63/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference

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References

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