Critical severity · published Aug 3, 2026
CVE-2026-18589
Wavlink WL-NU516U1 nas.cgi change_password stack-based overflow
9.8
CVSS
1.1%
EPSS
No
On KEV
Description
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 65% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
WL
WL-NU516U1 · Wavlink
708c073-mt7628 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18589
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18589
dl.wavlink.com
https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.bin
github.com
https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.md
vuldb.com
https://vuldb.com/cve/CVE-2026-18589
vuldb.com
https://vuldb.com/submit/850501
vuldb.com
https://vuldb.com/vuln/385417
vuldb.com
https://vuldb.com/vuln/385417/cti
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