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CVE-2026-4861

Published: Mar 26, 2026

Modified: Mar 26, 2026

PUBLISHED

CVSS v3.1

8.8

HIGH

Description

A weakness has been identified in Wavlink WL-NU516U1 260227. This vulnerability affects the function ftext of the file /cgi-bin/nas.cgi. This manipulation of the argument Content-Length causes stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

Vendor	Product	Versions
Wavlink	WL-NU516U1	affected `260227`

Weaknesses (CWE)

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

References

VDB-353192 | Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow

vdb-entry

technical-description

VDB-353192 | CTI Indicators (IOB, IOC, IOA)

signature

permissions-required

Submit #776217 | Wavlink NU516U1 V260227 Stack-based Buffer Overflow

third-party-advisory

https://github.com/Wlz1112/WAVLINK-NU516U1-V260227/blob/main/Content-Length.md

exploit

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