CVE-2026-3704 Details
Description
A vulnerability has been found in Wavlink NU516U1 251208. This vulnerability affects the function sub_405B2C of the file /cgi-bin/firewall.cgi of the component Incomplete Fix CVE-2025-10959. The manipulation leads to command injection. It is possible to initiate the attack remotely. The exploit has been disclosed to the public and may be used. It is recommended to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
A command injection vulnerability has been identified in the Wavlink NU516U1 router, specifically in the 251208 firmware version. This issue arises in the 'firewall.cgi' component, within the 'sub_405B2C' function, which was intended to filter user input for the 'dmz_flag' parameter. However, the filter is flawed, as it fails to block the semicolon character, allowing authenticated remote attackers to inject arbitrary commands that are executed with root privileges. This vulnerability is a patch bypass of CVE-2025-10959, as the same parameter was previously exploited in an unfiltered state.
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/wavlink_DMZ.md | [email protected] | ExploitThird Party Advisory |
| https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/wavlink_DMZ.md#exp | [email protected] | ExploitThird Party Advisory |
| https://vuldb.com/?ctiid.349650 | [email protected] | Permissions RequiredVDB Entry |
| https://vuldb.com/?id.349650 | [email protected] | Third Party AdvisoryVDB Entry |
| https://vuldb.com/?submit.759233 | [email protected] | Third Party AdvisoryVDB Entry |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-77 | Improper Neutralization of Special Elements used in a Command ('Command Injection') | [email protected] |
| CWE-74 | Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') | [email protected] |
| CWE-77 | Improper Neutralization of Special Elements used in a Command ('Command Injection') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| wavlink wl-nu516u1 firmware | 251208 |
CPE
Remediation
| |
| wavlink wl-nu516u1 | All versions |
CPE
Remediation
| |
Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Apr 29, 2026 | Data Remediation | [email protected] |
| Mar 10, 2026 | Initial Analysis | [email protected] |
| Mar 8, 2026 | New CVE Received | [email protected] |