Wavlink WL-WN530BE1-A 251117 Settings Export CGI ExportAllSettings.cgi strcpy HTTP_COOKIE/X-Cmd stack-based overflow

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
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CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
9.4$0-$5k2.54-

Summaryinfo

A vulnerability labeled as very critical has been found in Wavlink WL-WN530BE1-A 251117. This issue affects the function strcpy of the file /cgi-bin/ExportAllSettings.cgi of the component Settings Export CGI. Executing a manipulation of the argument HTTP_COOKIE/X-Cmd can lead to stack-based overflow. This vulnerability is registered as CVE-2026-109109. It is possible to launch the attack remotely. Furthermore, an exploit is available. The vendor was contacted early about this disclosure.

Detailsinfo

A vulnerability was found in Wavlink WL-WN530BE1-A 251117. It has been declared as very critical. This vulnerability affects the function strcpy of the file /cgi-bin/ExportAllSettings.cgi of the component Settings Export CGI. The manipulation of the argument HTTP_COOKIE/X-Cmd with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is 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). As an impact it is known to affect confidentiality, integrity, and availability.

The advisory is shared for download at gist.github.com. This vulnerability was named CVE-2026-109109. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Technical details and also a public exploit are known. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 10/12/2026).

It is possible to download the exploit at gist.github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.4

VulDB Base Score: 10.0
VulDB Temp Score: 9.4
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: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

10/12/2026 Advisory disclosed
10/12/2026 +0 days VulDB entry created
10/12/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: gist.github.com
Status: Confirmed

CVE: CVE-2026-109109 (🔒)
GCVE (CVE): GCVE-0-2026-109109
GCVE (VulDB): GCVE-100-416860
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 10/12/2026 10:38
Changes: 10/12/2026 10:38 (58)
Complete: 🔍
Submitter: Tarbely
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #909191: Wavlink WL-WN530BE1-A M30BE1_V251117 Stack-based Buffer Overflow (by Tarbely)

Once again VulDB remains the best source for vulnerability data.

Discussion

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