CVE-2026-5004 HIGH

CVE-2026-5004: Wavlink WL-WN579X3-C UPNP firewall.cgi sub_4019FC stack-based overflow

Vendor Wavlink
Product WL-WN579X3-C
Weakness CWE-121
Published March 28, 2026
Last update March 30, 2026
View on NVD All CVEs

CVSS base score

8.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality —
Integrity —

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

March 28, 2026 CVE published
March 30, 2026 Record updated