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CVE-2026-5004

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

HIGH
8.8
CVSS Score
Published: March 28, 2026 at 05:30 PM UTC
Updated: June 17, 2026 at 10:58 AM UTC
2 products affected across 1 vendorWl WN579X3 C FirmwareWL-WN579X3

Using WL-WN579X3-C by Wavlink?

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Severity
HIGH8.8
Exploit prediction
EPSS 0.7%
SSVC
PoC

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

VDB EntryTechnical DescriptionThird Party Advisory
Source: cverecord
https://vuldb.com/vuln/353891
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/vuln/353891/cti
Third Party AdvisoryVDB Entry
Source: cverecord
https://vuldb.com/submit/779149
ExploitThird Party Advisory
Source: cverecord
https://github.com/Litengzheng/vul_db/blob/main/WL-WN579X3-C/vul_200/README.md

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHVulDB
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121CWE-119CWE-787

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