CVE-2026-18589

CRITICAL 9.8

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

CVSS Score

9.8

EPSS Score

0.0%

EPSS Percentile

0th

A vulnerability was found in Wavlink WL-NU516U1 708c073-mt7628. This impacts the function change_password of the file nas.cgi. The manipulation of the argument User1Passwd results in stack-based buffer overflow. The attack can be executed remotely. The exploit has been made public and could be used. The affected component should be upgraded. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

CWE	CWE-121 CWE-119
Vendor	wavlink
Product	wl-nu516u1
Published	Aug 3, 2026

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CVSS v3 Breakdown

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

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Scope

Confidentiality

Integrity

Availability

Affected Versions

Wavlink / WL-NU516U1

708c073-mt7628

References

NVD ↗ CVE.org ↗ EPSS Data ↗

vuldb.com: https://vuldb.com/vuln/385417 vuldb.com: https://vuldb.com/vuln/385417/cti vuldb.com: https://vuldb.com/cve/CVE-2026-18589 vuldb.com: https://vuldb.com/submit/850501 github.com: https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md dl.wavlink.com: https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin

Credits

🔍 oduoke (VulDB User) VulDB CNA Team