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Vulnerability record · CVE-2026-3703 · published 8 March 2026

CVE-2026-3703: Wavlink wl-nu516u1 firmware memory buffer overflow vulnerability

Wavlink · Wl Nu516u1 Firmware

A flaw has been found in Wavlink NU516U1 251208. This affects the function sub_401A10 of the file /cgi-bin/login.cgi. Executing a manipulation of the argument ipaddr can lead to out-of-bounds write. The attack may be performed from remote. The exploit has been published and may be used. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

8.9 CVSS 4.0 High EPSS 1.2% · top 32.8% CWE-119 · Memory buffer overflowCWE-787 · Out-of-bounds write
8.9CVSS 4.0 base score, v2 10.0
1.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

A flaw has been found in Wavlink NU516U1 251208. This affects the function sub_401A10 of the file /cgi-bin/login.cgi. Executing a manipulation of the argument ipaddr can lead to out-of-bounds write. The attack may be performed from remote. The exploit has been published and may be used. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin Broken Link
https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md ExploitVendor Advisory
https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc ExploitVendor Advisory
https://vuldb.com/?ctiid.349649 Permissions RequiredVDB Entry
https://vuldb.com/?id.349649 Third Party AdvisoryVDB Entry
https://vuldb.com/?submit.759226 Third Party AdvisoryVDB Entry

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2026-3703), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.