CVE-2026-13539 Details
Description
A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425. The impacted element is the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Such manipulation of the argument Guest_ssid leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. It is suggested to 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.
A stack-based buffer overflow vulnerability has been identified in the Wavlink WL-NU516U1 router, specifically in the M16U1_V240425 firmware version. The issue arises in the '/cgi-bin/wireless.cgi' file within the POST Parameter Handler component. The vulnerability is triggered by manipulating the 'Guest_ssid' parameter, which leads to a stack overflow by exceeding the buffer's capacity. This vulnerability can be exploited remotely, and a public exploit is available.
Users are advised to upgrade to the fixed version of the product.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Jun 29, 2026CISA-ADP
Assessed Jun 29, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-06-22-5ccde97-mt7628-squashfs-sysupgrade.bin | [email protected] | Broken LinkVendor |
| https://github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-guestwifi-guestssid-buffer-overflow | [email protected] | ExploitTechnical Analysis |
| https://vuldb.com/cve/CVE-2026-13539 | [email protected] | AdvisoryPermission Required |
| https://vuldb.com/submit/834024 | [email protected] | Issue TrackingPermission Required |
| https://vuldb.com/vuln/374547 | [email protected] | AdvisoryPartial Content |
| https://vuldb.com/vuln/374547/cti | [email protected] | AdvisoryPartial Content |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-119 | Improper Restriction of Operations within the Bounds of a Memory Buffer | [email protected] |
| CWE-121 | Stack-based Buffer Overflow | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| Wavlink WL-NU516U1 | M16U1_V240425 |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 29, 2026 | CVE Modified | CISA-ADP |
| Jun 29, 2026 | New CVE Received | [email protected] |