Vulnerability Description
The function CheckMic() 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 internal function, _rt_md5_hmac_veneer() or _rt_hmac_sha1_veneer(), resulting in a stack buffer over-read which can be exploited for 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 does not need to know the network's PSK.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Realtek | Rtl8195A Firmware | < 2.08 |
| Realtek | Rtl8195A | - |
Related Weaknesses (CWE)
References
- https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ExploitThird Party Advisory
- https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ExploitThird Party Advisory
FAQ
What is CVE-2020-25853?
CVE-2020-25853 is a vulnerability with a CVSS score of 7.5 (HIGH). The function CheckMic() 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 internal function, _rt_md5_...
How severe is CVE-2020-25853?
CVE-2020-25853 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-25853?
Check the references section above for vendor advisories and patch information. Affected products include: Realtek Rtl8195A Firmware, Realtek Rtl8195A.