CVE-2026-18588
Wavlink WL-NU516U1 nas.cgi fgets stack-based overflow
- State
- Published
- Severity
- 9.3 Critical
- Published
- Aug 3, 2026
- Updated
- Aug 3, 2026
- Reserved
- Aug 2, 2026
Description
A vulnerability has been found in Wavlink WL-NU516U1 708c073-mt7628. This affects the function fgets of the file nas.cgi. The manipulation of the argument CONTENT_LENGTH leads to stack-based buffer overflow. Remote exploitation of the attack is possible. You should upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X | VulDB |
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C | VulDB |
| 3.0 | 9.8 Critical | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:X/RL:O/RC:C | VulDB |
| 2.0 | 10.0 High | AV:N/AC:L/Au:N/C:C/I:C/A:C/E:ND/RL:OF/RC:C | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
WL-NU516U1Wavlink |
|
References
- VDB-385416 | Wavlink WL-NU516U1 nas.cgi fgets stack-based overflowvdb-entrytechnical-description
- VDB-385416 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-18588 | CVE Analysis and Reportthird-party-advisory
- Submit #850500 | WAVLINK WL-NU516U1 2026-05-15 (build 708c073-mt7628) Command Injectionthird-party-advisory
- https://github.com/oduoke567/WAVLINK-NU516U1-2026-05-1/blob/main/report2.mdbroken-link
- https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-07-13-4b8a21f-mt7628-squashfs-sysupgrade.binbroken-linkpatch
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