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

September 2nd, 2025
ZDI-25-882 ZDI-CAN-25857

CVE ID

CVE-2025-8299

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 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.

Additional Details

Fixed in v1030.44.1204.2024 - https://www.realtek.com/Article/Index?menu_id=848


Disclosure Timeline

  • 2025-02-13 - 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

Back to Advisories