TP-Link TL-MR100 up to 3.20 GDPR Decrypt /cgi/login http_gdpr_decrypt stack-based overflow

Summaryinfo

A vulnerability marked as very critical has been reported in TP-Link TL-MR100 up to 3.20. The impacted element is the function http_gdpr_decrypt of the file /cgi/login of the component GDPR Decrypt. The manipulation leads to stack-based overflow. This vulnerability is listed as CVE-2026-75118. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in TP-Link TL-MR100 up to 3.20. It has been rated as very critical. This issue affects the function http_gdpr_decrypt of the file /cgi/login of the component GDPR Decrypt. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to 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). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A pre-authentication stack-based buffer overflow vulnerability exists in the http_gdpr_decrypt function of TL-MR100 V3.20 due to insufficient bounds checking of encrypted requests to the /cgi/login endpoint. An adjacent unauthenticated attacker with access to the router's web management interface can trigger memory corruption and potentially achieve arbitrary code execution. Successful exploitation can overwrite saved control-flow data on the httpd process stack prior to authentication, resulting in a service crash or potential arbitrary code execution in the context of the affected process.

The advisory is shared at tp-link.com. The identification of this vulnerability is CVE-2026-75118 since 08/17/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/29/2026).

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

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Router Operating System

Vendor

• TP-Link

Name

• TL-MR100

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11
• 3.12
• 3.13
• 3.14
• 3.15
• 3.16
• 3.17
• 3.18
• 3.19
• 3.20

License

• commercial

Website

• Vendor: https://www.tp-link.com/

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Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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