CVE-2020-25856: Realtek RTL8195A Firmware

High severity, CVSS 8.1. EPSS: 2.2% chance of exploitation in the next 30 days.

The function DecWPA2KeyData() in the Realtek RTL8195A Wi-Fi Module prior to versions released in April 2020 (up to and excluding 2.08) does not validate the size parameter for an rtl_memcpy() operation, resulting in a stack buffer overflow which can be exploited for remote code execution or denial of service. An attacker can impersonate an Access Point and attack a vulnerable Wi-Fi client, by injecting a crafted packet into the WPA2 handshake. The attacker needs to know the network's PSK in order to exploit this.

Affected products

• Realtek RTL8195A Firmware: before 2.08 (fixed in 2.08)

Published 2021-02-03. Last modified 2026-06-17.