CVE-2026-3703
Wavlink NU516U1 login.cgi sub_401A10 out-of-bounds write
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.
INFO
Published Date :
March 8, 2026, 5:16 a.m.
Last Modified :
March 10, 2026, 6:55 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-3703
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 2.0 | HIGH | [email protected] | ||||
| CVSS 3.1 | CRITICAL | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Upgrade the affected component to the fixed version.
- Apply vendor-released patches or updates.
- Verify the integrity of the updated component.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-3703.
| URL | Resource |
|---|---|
| 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 | Exploit Vendor Advisory |
| https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc | Exploit Vendor Advisory |
| https://vuldb.com/?ctiid.349649 | Permissions Required VDB Entry |
| https://vuldb.com/?id.349649 | Third Party Advisory VDB Entry |
| https://vuldb.com/?submit.759226 | Third Party Advisory VDB Entry |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-3703 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-3703
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-3703 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-3703 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 10, 2026
Action Type Old Value New Value Added CPE Configuration AND OR *cpe:2.3:o:wavlink:wl-nu516u1_firmware:251208:*:*:*:*:*:*:* OR cpe:2.3:h:wavlink:wl-nu516u1:-:*:*:*:*:*:*:* Added Reference Type VulDB: https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin Types: Broken Link Added Reference Type VulDB: https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md Types: Exploit, Vendor Advisory Added Reference Type VulDB: https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc Types: Exploit, Vendor Advisory Added Reference Type VulDB: https://vuldb.com/?ctiid.349649 Types: Permissions Required, VDB Entry Added Reference Type VulDB: https://vuldb.com/?id.349649 Types: Third Party Advisory, VDB Entry Added Reference Type VulDB: https://vuldb.com/?submit.759226 Types: Third Party Advisory, VDB Entry -
New CVE Received by [email protected]
Mar. 08, 2026
Action Type Old Value New Value Added 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. Added CVSS V4.0 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:X/V:X/RE:X/U:X Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Added CVSS V2 (AV:N/AC:L/Au:N/C:C/I:C/A:C) Added CWE CWE-119 Added CWE CWE-787 Added Reference https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-02-27-2fcf6ae-mt7628-squashfs-sysupgrade.bin Added Reference https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md Added Reference https://github.com/Wlz1112/Wavlink-NU516U1-V251208-/blob/main/ipaddr.md#exp-exploit--poc Added Reference https://vuldb.com/?ctiid.349649 Added Reference https://vuldb.com/?id.349649 Added Reference https://vuldb.com/?submit.759226