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CVE-2026-18589— Wavlink WL-NU516U1 nas.cgi change_password 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 firmware是中国WAVLINK公司的一款一套无线网卡的固件程序。 WAVLINK wl-nu516u1 firmware 708c073-mt7628版本存在缓冲区错误漏洞，该漏洞源于对文件nas.cgi中change_password函数参数User1Passwd的错误操作，可能导致栈缓冲区溢出，攻击者可远程执行攻击。

CVSS 9.8 · Critical EPSS 1.10% · P65

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wavlink WL-NU516U1 708c073-mt7628 affected
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I. Basic Information for CVE-2026-18589

Vulnerability Information
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Vulnerability Title
Wavlink WL-NU516U1 nas.cgi change_password stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was found in Wavlink WL-NU516U1 708c073-mt7628. This impacts the function change_password of the file nas.cgi. The manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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 firmware 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAVLINK wl-nu516u1 firmware是中国WAVLINK公司的一款一套无线网卡的固件程序。 WAVLINK wl-nu516u1 firmware 708c073-mt7628版本存在缓冲区错误漏洞，该漏洞源于对文件nas.cgi中change_password函数参数User1Passwd的错误操作，可能导致栈缓冲区溢出，攻击者可远程执行攻击。
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 708c073-mt7628 cpe:2.3:o:wavlink:wl-nu516u1_firmware:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-18589

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III. Intelligence Information for CVE-2026-18589

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Security Blog Posts for CVE-2026-18589 (1)

Same Patch Batch · Wavlink · 2026-08-03 · 5 CVEs total

CVE-2026-18588 9.8 CRITICAL Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow
CVE-2026-18607 8.8 HIGH Wavlink NU516 lighttpd upload.cgi strcpy stack-based overflow
CVE-2026-18587 7.5 HIGH Wavlink WL-NU516U1 Config Import os command injection
CVE-2026-18590 6.3 MEDIUM Wavlink WL-NU516U1 Admin Password adm.cgi set_sys_adm os command injection

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-18589

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