CVE-2026-4543: A vulnerability was found in Wavlink WL-WN578W2 221110

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MEDIUM 6.3MITIGATE

CVE-2026-4543 is a medium-severity flaw (CVSS 6.3) affecting wl-wn578w2 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability was found in Wavlink WL-WN578W2 221110. The impacted element is an unknown function of the file /cgi-bin/firewall.cgi of the component POST Request Handler. Performing a manipulation of the argument dmz_flag/del_flag results in command injection. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Why this priority

EPSS top 7%: very likely to be exploited
Public exploit reference

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

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	5.6% (top 7%)
CISA exploited list	No
Weakness	CWE-74, CWE-77
Published	2026-03-22
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: wavlink

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

Am I affected?

Timeline

2026-03-22 10:16 UTCPublished CVE record published
2026-06-17 10:56 UTCUpdated Record last modified

wavlink wl-wn578w2 firmware MITIGATE

Affected: 221110

Fixed in: no fixed release known

Safe to downgrade to: a release before 221110

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-2026-4543?

wl-wn578w2 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2026-4543 being exploited?

CVE-2026-4543 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-2026-4543 affect?

CVE-2026-4543 affects wl-wn578w2 firmware. Severity is medium (CVSS 6.3). A vulnerability was found in Wavlink WL-WN578W2 221110. The impacted element is an unknown function of the file /cgi-bin/firewall.cgi of the component POST Request Handler. Performing a manipulation of the argument dmz_flag/del_flag results

How urgent is CVE-2026-4543?

Priority 50/100. EPSS top 7%: very likely to be exploited; Public exploit reference

Related CVEs

CVE-2026-4544 LOW 2.4 MITIGATE A vulnerability was determined in Wavlink WL-WN578W2 221110

References

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