Advisory Details

September 2nd, 2025

Realtek rtl81xx SDK Wi-Fi Driver rtwlanu Heap-based Buffer Overflow Local Privilege Escalation Vulnerability

ZDI-25-883
ZDI-CAN-26552

CVE ID CVE-2025-8300
CVSS SCORE 8.8, AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS Realtek
AFFECTED PRODUCTS rtl81xx SDK
VULNERABILITY DETAILS

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.
ADDITIONAL DETAILS

Fixed in v1030.44.1204.2024 - https://www.realtek.com/Article/Index?menu_id=848
DISCLOSURE TIMELINE
  • 2025-02-21 - Vulnerability reported to vendor
  • 2025-09-02 - Coordinated public release of advisory
  • 2025-09-02 - Advisory Updated
CREDIT dungnm from vcslab of Viettel Cyber Security
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