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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (2.16%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 8.1 HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 2.16% probability · 81th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-121, CWE-787
- Affected
- realtek/rtl8195a firmware
- Source
- vuln@vdoo.com
References
- https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/Exploit, Third Party Advisory
- https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/Exploit, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.