CVE-2020-25853
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductRealtek Rtl8195a Firmware
PublishedFeb 3, 2021
First seenFeb 3, 2021
Weakness typeCWE-126CWE-126
How to fix
Update
- realtek rtl8195a_firmware2.08 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| realtek rtl8195a_firmware | v < 2.08 | 2.08 |
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