What is the CVSS score of CVE-2026-3703?

CVE-2026-3703 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 0.2%.

Which versions of Wl Nu516u1 Firmware are affected by CVE-2026-3703?

A critical vulnerability (CVSS 9.8) in Wavlink NU516U1 network devices allows unauthenticated remote attackers to compromise affected systems through the login interface.

Is there a public PoC exploit available for CVE-2026-3703?

Yes, a public proof-of-concept exploit is available for CVE-2026-3703. Prioritise patching immediately. EPSS: 0.2%.

How to fix or mitigate CVE-2026-3703?

Within 24 hours: Identify and inventory all Wavlink NU516U1 devices in your environment and isolate them from production networks if possible. Within 7 days: Implement network segmentation to restrict access to the affected devices, disable remote management features, and monitor for exploitation attempts. Within 30 days: Develop a replacement or upgrade strategy with the vendor, and establish a timeline for decommissioning vulnerable devices once patches or alternatives are available.

Wl Nu516u1 Firmware CVE-2026-3703

CRITICAL

Buffer Overflow (CWE-119)

2026-03-08 cna@vuldb.com

Buffer Overflow Wl Nu516u1 Firmware Wavlink

9.8

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 12, 2026 - 21:55 vuln.today

PoC Detected

Mar 10, 2026 - 18:55 vuln.today

Public exploit code

CVE Published

Mar 08, 2026 - 05:16 nvd

CRITICAL 9.8

DescriptionCVE.org

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.