Vulnerability · Published Mar 28, 2026 · Assigned by VulDB

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

High 8.8

In plain English

A high-severity stack buffer overflow in WL-WN579X3-C from Wavlink. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High

Exploit odds (30 days)0.7%top 46.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Wavlink	WL-WN579X3-C	231124

Weakness: CWE-121, CWE-119 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R

References

VDB-353891 | Wavlink WL-WN579X3-C UPNP firewall.cgi sub_4019FC stack-based overflow vdb-entry, technical-description
VDB-353891 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #779149 | Wavlink WL-WN579X3-C V231124 Stack-based Buffer Overflow third-party-advisory
https://github.com/Litengzheng/vul_db/blob/main/WL-WN579X3-C/vul_200/README.md exploit