CVE-2025-8299
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-09-02

Last updated on: 2025-09-10

Assigner: Zero Day Initiative

Description
Realtek rtl81xx SDK Wi-Fi Driver MgntActSet_TEREDO_SET_RS_PACKET 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 MgntActSet_TEREDO_SET_RS_PACKET 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-25857.
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Meta Information
Published
2025-09-02
Last Modified
2025-09-10
Generated
2026-06-16
AI Q&A
2025-09-02
EPSS Evaluated
2026-06-14
NVD
CVE-2025-8299
EUVD
EUVD-2025-26431
Affected Vendors & Products
Showing 2 associated CPEs
Vendor Product Version / Range
realtek wi-fi_usb_driver to 1030.52.0325.2025 (exc)
realtek rtl8811au *
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
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().
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Executive Summary

CVE-2025-8299 is a heap-based buffer overflow vulnerability in the Realtek rtl81xx SDK Wi-Fi driver, specifically in the MgntActSet_TEREDO_SET_RS_PACKET function. The flaw occurs because the driver does not properly validate the length of user-supplied data before copying it into a fixed-length heap buffer. An attacker who already has the ability to run low-privileged code locally can exploit this vulnerability to escalate their privileges to SYSTEM level, allowing them to execute arbitrary code with full system privileges. [1]

Impact Analysis

This vulnerability can allow a local attacker with low privileges to escalate their privileges to SYSTEM level on an affected system. This means the attacker could gain full control over the system, execute arbitrary code, compromise confidentiality, integrity, and availability of the system, potentially leading to complete system takeover. [1]

Mitigation Strategies

To mitigate this vulnerability, ensure that you update or patch the Realtek rtl81xx SDK Wi-Fi driver to a version where this heap-based buffer overflow in the MgntActSet_TEREDO_SET_RS_PACKET function is fixed. Since exploitation requires local low-privileged code execution, restricting local access and monitoring for suspicious local activity can also help reduce risk until a patch is applied. [1]

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