CVE-2026-3703

CRITICAL 9.8

Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-787 CWE-119
Vendor	wavlink
Product	nu516u1
Published	Mar 8, 2026
Last Updated	Mar 10, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Wavlink / NU516U1

251208

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/?id.349649 vuldb.com: https://vuldb.com/?ctiid.349649 vuldb.com: https://vuldb.com/?submit.759226 github.com: https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md github.com: https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc dl.wavlink.com: https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin

Credits

🔍 haimianbaobao (VulDB User) VulDB