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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CTI Interest Score
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7.9$0-$5k1.45

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.

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

AVACAuCIA
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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: 🔒
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
06/28/2026 +0 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
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 06/28/2026 12:07
Changes: 06/28/2026 12:07 (60)
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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