How severe is CVE-2026-5004?

CVE-2026-5004 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-5004 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-5004?

CVE-2026-5004 affects Wavlink Wl-wn579x3-c Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-5004?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-5004 have an EU (EUVD) identifier?

Yes. CVE-2026-5004 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16937.

When was CVE-2026-5004 published?

CVE-2026-5004 was published on 2026-03-28 and last updated on 2026-06-17.

CVE-2026-5004

CVE-2026-5004 is a high-severity vulnerability in Wavlink Wl-wn579x3-c Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.0
CVSS v4: 7.4
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16937
Weakness: CWE-787
Affected product: Wavlink Wl-wn579x3-c Firmware
Published: 2026-03-28
Last modified: 2026-06-17

Description

A vulnerability was determined in Wavlink WL-WN579X3-C 231124. This impacts the function sub_4019FC of the file /cgi-bin/firewall.cgi of the component UPNP Handler. Executing a manipulation of the argument UpnpEnabled can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

Frequently asked questions

What is CVE-2026-5004?: A vulnerability was determined in Wavlink WL-WN579X3-C 231124. This impacts the function sub_4019FC of the file /cgi-bin/firewall.cgi of the component UPNP Handler. Executing a manipulation of the argument UpnpEnabled can lead to stack-based buffer overflow. It is possible to launch the attack remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.
How severe is CVE-2026-5004?: CVE-2026-5004 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-5004 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-5004?: CVE-2026-5004 affects Wavlink Wl-wn579x3-c Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-5004?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-5004 have an EU (EUVD) identifier?: Yes. CVE-2026-5004 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16937.
When was CVE-2026-5004 published?: CVE-2026-5004 was published on 2026-03-28 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:o:wavlink:wl-wn579x3-c_firmware:231124:*:*:*:*:*:*:*

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