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CVE-2026-4861

Wavlink WL-NU516U1 nas.cgi ftext stack-based overflow

HIGH
8.8
CVSS Score
Published: March 26, 2026 at 08:18 AM UTC
Updated: June 17, 2026 at 10:57 AM UTC
2 products affected across 1 vendorWl NU516U1 FirmwareWL-NU516U1

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Severity
HIGH8.8
Exploit prediction
EPSS 0.9%
SSVC
PoC

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (4)

VDB EntryTechnical DescriptionThird Party Advisory
Source: cverecord
https://vuldb.com/?id.353192
SignaturePermissions RequiredVDB Entry
Source: cverecord
https://vuldb.com/?ctiid.353192
Third Party AdvisoryVDB Entry
Source: cverecord
https://vuldb.com/?submit.776217
ExploitThird Party Advisory
Source: cverecord
https://github.com/Wlz1112/WAVLINK-NU516U1-V260227/blob/main/Content-Length.md

SSVC — Action Prioritization

SSVCPoCNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHVulDB
Vector?

Quick Info

StatusANALYZED
CWE
CWE-121CWE-119

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