Buffer overflow in Realtek Rtl8195a
CVE-2020-25856
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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.022 (81.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 81st percentile — 81.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000
Affected products
- Realtek Rtl8195a
- Realtek Rtl8195a Firmware
- Realtek Rtl8195a Wi-Fi Module — versions Versions before 2020-04-21 (up to and excluding 2.08)
Weakness classification (CWE)
References
- www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-25856?
- CVE-2020-25856 is a high-severity vulnerability in Realtek Rtl8195a, classified under Stack-based Buffer Overflow. CVSS score: 8.1/10. Published 2021-02-03.
- How severe is CVE-2020-25856?
- High severity. CVSS v3 base score is 8.1 out of 10.