High severity · published Feb 16, 2026
CVE-2026-2566
Wavlink WL-NU516U1 adm.cgi sub_406194 stack-based overflow
7.2
CVSS
0.5%
EPSS
No
On KEV
Description
A security vulnerability has been detected in Wavlink WL-NU516U1 up to 130/260. This affects the function sub_406194 of the file /cgi-bin/adm.cgi. Such manipulation of the argument firmware_url leads to stack-based buffer overflow. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. 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:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WL
WL-NU516U1 · Wavlink
130; 260 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-2566
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-2566
github.com
https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/firmware_url.md
vuldb.com
https://vuldb.com/?ctiid.346173
vuldb.com
https://vuldb.com/?id.346173
vuldb.com
https://vuldb.com/?submit.751908
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