CVE-2026-18589: Stack-based Buffer Overflow in Wavlink WL-NU516U1
CVE-2026-18589 is a critical stack-based buffer overflow vulnerability in the Wavlink WL-NU516U1 device, specifically in the change_password function of the nas.cgi file. The vulnerability is triggered by manipulating the User1Passwd argument remotely without authentication. A fixed version has been released by the vendor following responsible disclosure.
AI Analysis
Technical Summary
This vulnerability affects Wavlink WL-NU516U1 version 708c073-mt7628. The change_password function in nas.cgi improperly handles the User1Passwd argument, leading to a stack-based buffer overflow. This flaw allows unauthenticated remote attackers to potentially execute arbitrary code or cause denial of service. The vendor was promptly notified and has released a fixed version to address the issue.
Potential Impact
Successful exploitation can lead to remote code execution or denial of service on the affected device without requiring authentication. The vulnerability has a CVSS 4.0 base score of 9.3, indicating critical severity with high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A fixed version of the affected product has been released by the vendor. Users should upgrade to the vendor-provided fixed version to remediate this vulnerability. Patch status is not explicitly stated in the input, but the vendor's quick release of a fix indicates an official patch is available.
CVE-2026-18589: Stack-based Buffer Overflow in Wavlink WL-NU516U1
Description
CVE-2026-18589 is a critical stack-based buffer overflow vulnerability in the Wavlink WL-NU516U1 device, specifically in the change_password function of the nas.cgi file. The vulnerability is triggered by manipulating the User1Passwd argument remotely without authentication. A fixed version has been released by the vendor following responsible disclosure.
CVSS v4.0
Score 9.3critical
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability affects Wavlink WL-NU516U1 version 708c073-mt7628. The change_password function in nas.cgi improperly handles the User1Passwd argument, leading to a stack-based buffer overflow. This flaw allows unauthenticated remote attackers to potentially execute arbitrary code or cause denial of service. The vendor was promptly notified and has released a fixed version to address the issue.
Potential Impact
Successful exploitation can lead to remote code execution or denial of service on the affected device without requiring authentication. The vulnerability has a CVSS 4.0 base score of 9.3, indicating critical severity with high impact on confidentiality, integrity, and availability.
Mitigation Recommendations
A fixed version of the affected product has been released by the vendor. Users should upgrade to the vendor-provided fixed version to remediate this vulnerability. Patch status is not explicitly stated in the input, but the vendor's quick release of a fix indicates an official patch is available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-08-02T20:33:42.866Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a703650bf32cb7a341831ca
Added to database: 08/03/2026, 06:33:52 UTC
Last enriched: 08/03/2026, 06:48:07 UTC
Last updated: 08/03/2026, 07:31:48 UTC
Views: 22
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