CVE-2026-5004

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

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

Wavlink · WL-WN579X3-C

CVSS v4.0 VULDB

7.4 HIGHCVSS: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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 VULDB

8.8 HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0 VULDB

9.0 HIGHAV:N/AC:L/Au:S/C:C/I:C/A:C

EPSS

1.06% chance of exploitation in the next 30 days, 64th percentile

Published

2026-03-28

Updated

2026-03-30

Proof-of-concept exploits (1)

• Litengzheng/vul_db/blob/main/WL-WN579X3-C/vul_200/README.md3★ · 2026-04-28

Security advisories

• https://vuldb.com/submit/779149
• https://vuldb.com/vuln/353891

References

• CVE Record
• NVD entry