Realtek rtl81xx SDK 1030.38.712.2019 N6CSet_DOT11_CIPHER_DEFAULT_KEY heap-based overflow

Summaryinfo

A vulnerability was found in Realtek rtl81xx SDK 1030.38.712.2019. It has been rated as critical. Affected by this vulnerability is the function N6CSet_DOT11_CIPHER_DEFAULT_KEY. Performing a manipulation results in heap-based overflow. This vulnerability is known as CVE-2025-8300. Attacking locally is a requirement. No exploit is available.

Detailsinfo

A vulnerability classified as critical has been found in Realtek rtl81xx SDK 1030.38.712.2019. This affects the function N6CSet_DOT11_CIPHER_DEFAULT_KEY. The manipulation with an unknown input leads to a heap-based overflow vulnerability. CWE is classifying the issue as CWE-122. A heap overflow condition is a buffer overflow, where the buffer that can be overwritten is allocated in the heap portion of memory, generally meaning that the buffer was allocated using a routine such as malloc(). This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Realtek rtl81xx SDK Wi-Fi Driver rtwlanu Heap-based Buffer Overflow Local Privilege Escalation Vulnerability. This vulnerability allows local attackers to escalate privileges on affected installations of Realtek rtl81xx SDK Wi-Fi driver. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the N6CSet_DOT11_CIPHER_DEFAULT_KEY function. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length heap-based buffer. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of SYSTEM. Was ZDI-CAN-26552.

The advisory is shared at zerodayinitiative.com. This vulnerability is uniquely identified as CVE-2025-8300 since 07/29/2025. The exploitability is told to be easy. An attack has to be approached locally. 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 09/03/2025).

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

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Vendor

• Realtek

Name

• rtl81xx SDK

Version

• 1030.38.712.2019

License

• commercial

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