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CVE-2026-2565— Wavlink WL-NU516U1 adm.cgi sub_40785C stack-based overflow

Quick assessment

Affected
Wavlink WL-NU516U1
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WAVLINK WL-NU516U1是中国睿因（WAVLINK）公司的一款无线打印服务器。 WAVLINK WL-NU516U1 20251208版本存在安全漏洞，该漏洞源于对文件/cgi-bin/adm.cgi中参数time_zone的错误操作，可能导致栈缓冲区溢出。

CVSS 6.6 · Medium EPSS 1.01% · P62

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-2565

Vulnerability Information
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Vulnerability Title
Wavlink WL-NU516U1 adm.cgi sub_40785C stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A weakness has been identified in Wavlink WL-NU516U1 20251208. Affected by this issue is the function sub_40785C of the file /cgi-bin/adm.cgi. This manipulation of the argument time_zone causes stack-based buffer overflow. The attack can be initiated remotely. The attack is considered to have high complexity. The exploitation is known to be difficult. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
WAVLINK WL-NU516U1 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAVLINK WL-NU516U1是中国睿因（WAVLINK）公司的一款无线打印服务器。 WAVLINK WL-NU516U1 20251208版本存在安全漏洞，该漏洞源于对文件/cgi-bin/adm.cgi中参数time_zone的错误操作，可能导致栈缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wavlink WL-NU516U1 20251208 cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-2565

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III. Intelligence Information for CVE-2026-2565

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Same Patch Batch · Wavlink · 2026-02-16 · 8 CVEs total

CVE-2026-2567 7.2 HIGH Wavlink WL-NU516U1 nas.cgi sub_401218 stack-based overflow
CVE-2026-2566 7.2 HIGH Wavlink WL-NU516U1 adm.cgi sub_406194 stack-based overflow
CVE-2026-2530 6.3 MEDIUM Wavlink WL-WN579A3 wireless.cgi AddMac command injection
CVE-2026-2529 6.3 MEDIUM Wavlink WL-WN579A3 wireless.cgi DeleteMac command injection
CVE-2026-2528 6.3 MEDIUM Wavlink WL-WN579A3 wireless.cgi Delete_Mac_list command injection
CVE-2026-2527 6.3 MEDIUM Wavlink WL-WN579A3 login.cgi command injection
CVE-2026-2526 6.3 MEDIUM Wavlink WL-WN579A3 wireless.cgi multi_ssid command injection

IV. Related Vulnerabilities

Same product: WL-NU516U1
Same vendor: Wavlink
Same weakness: CWE-121

V. Comments for CVE-2026-2565

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