CVE-2026-3703 Details
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.
A stack buffer overflow vulnerability has been identified in the Wavlink NU516U1 router, specifically in the V251208 firmware. The issue resides in the login.cgi file, within the sub_401A10 function, which handles the sys_login1 interface. The vulnerability is triggered by manipulating the ipaddr parameter, allowing for an out-of-bounds write that could lead to a segmentation fault, causing a denial-of-service condition. Under certain circumstances, this vulnerability could be exploited to execute remote code.
Users are advised to upgrade to the latest version of the Wavlink NU516U1 firmware, which is available on the Wavlink Firmware Download page.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 10, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin | [email protected] | Broken Link |
| https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md | [email protected] | ExploitVendor Advisory |
| https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc | [email protected] | ExploitVendor Advisory |
| https://vuldb.com/?ctiid.349649 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.349649 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.759226 | [email protected] | Third Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-787 | Out-of-bounds Write | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wavlink wl-nu516u1 firmware | 251208 |
CPE
Remediation
| |
| wavlink wl-nu516u1 | All versions |
CPE
Remediation
| |
Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 10, 2026 | Initial Analysis | [email protected] |
| Mar 8, 2026 | New CVE Received | [email protected] |