Stack-Based Buffer Overflow Vulnerability in Wavlink WL-NU516U1
CVE-2026-18589

9.3CRITICAL

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
3 August 2026

What is CVE-2026-18589?

A stack-based buffer overflow vulnerability has been identified in the Wavlink WL-NU516U1 device, specifically in the change_password function of the nas.cgi file. The issue arises from improper handling of the User1Passwd argument, allowing remote attackers to exploit this vulnerability and potentially execute malicious code. Publicly available exploits have emerged, prompting urgent action for users to upgrade to the latest firmware version to mitigate the risk. The vendor has been responsive to the issue and has released a patch to address the vulnerability.

Affected Version(s)

WL-NU516U1 708c073-mt7628

References

https://vuldb.com/vuln/385417
vdb-entrytechnical-description
https://vuldb.com/vuln/385417/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18589
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

oduoke (VulDB User)
VulDB CNA Team
.