High severity · published Mar 28, 2026
CVE-2026-5004
Wavlink WL-WN579X3-C UPNP firewall.cgi sub_4019FC stack-based overflow
8.8
CVSS
0.7%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 53% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WL
WL-WN579X3-C · Wavlink
231124 · source: vendor
WF
Wl-wn579x3-c Firmware · Wavlink
231124 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-5004
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-5004
Exploit
https://github.com/Litengzheng/vul_db/blob/main/WL-WN579X3-C/vul_200/README.md
Third Party Advisory
https://vuldb.com/submit/779149
Third Party Advisory
https://vuldb.com/vuln/353891
Permissions Required
https://vuldb.com/vuln/353891/cti
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