Wavlink WL-NU516U1-A M16U1_V240425 POST Parameter /cgi-bin/wireless.cgi sub_407504 Guest_ssid stack-based overflow

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Wavlink WL-NU516U1-A M16U1_V240425. It has been classified as critical. This affects the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Performing a manipulation of the argument Guest_ssid results in stack-based overflow. This vulnerability is reported as CVE-2026-13539. The attack is possible to be carried out remotely. Moreover, an exploit is present. Upgrading the affected component is recommended. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Detailsinfo

A vulnerability, which was classified as critical, was found in Wavlink WL-NU516U1-A M16U1_V240425. This affects the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. The manipulation of the argument Guest_ssid with an unknown input leads to a stack-based overflow vulnerability. CWE is classifying the issue as CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). This is going to have an impact on confidentiality, integrity, and availability.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-13539. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details and a public exploit are known.

The exploit is shared for download at github.com. It is declared as proof-of-concept. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at dl.wavlink.com.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-40037). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.8
VulDB Meta Temp Score: 7.9

VulDB Base Score: 8.8
VulDB Temp Score: 7.9
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: dl.wavlink.com

Timelineinfo

06/28/2026 Advisory disclosed
06/28/2026 +0 days VulDB entry created
06/29/2026 +1 days VulDB entry last update

Sourcesinfo

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-13539 (🔒)
GCVE (CVE): GCVE-0-2026-13539
GCVE (VulDB): GCVE-100-374547
EUVD: 🔒
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/28/2026 12:07
Updated: 06/29/2026 11:02
Changes: 06/28/2026 12:07 (60), 06/29/2026 11:02 (1)
Complete: 🔍
Submitter: JuneGu
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #834024: Wavlink WL-NU516U1-A M16U1_V240425 Buffer Overflow (by JuneGu)

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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