Buffer overflow in Realtek Rtl81xx Sdk
CVE-2025-8302
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-26553.
Vulnerability class: Buffer Overflow
EPSS: 0.001 (3.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Realtek Rtl81xx Sdk — versions 1030.38.712.2019
- Realtek Rtl8811au
- Realtek Wi-fi_usb_driver
Weakness classification (CWE)
Public proof-of-concept exploits
References
- zdi-disclosures@trendmicro.com (x_research-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2025-8302?
- CVE-2025-8302 is a high-severity vulnerability in Realtek Rtl81xx Sdk, classified under Heap-based Buffer Overflow. CVSS score: 8.8/10. Published 2025-09-02.
- How severe is CVE-2025-8302?
- High severity. CVSS v3 base score is 8.8 out of 10.
- Is CVE-2025-8302 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.