Vulnerability · Published Feb 3, 2021 · Assigned by VDOO

CVE-2020-25857

High 7.5

In plain English

A high-severity stack buffer overflow in Realtek RTL8195A Wi-Fi Module. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.2% (higher than 69% of all known vulnerabilities).

Severity (CVSS NVD)7.5High

Exploit odds (30 days)1.2%top 30.6% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

The function ClientEAPOLKeyRecvd() 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 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.

Affected products (as reported)

Vendor	Product	Versions
n/a	Realtek RTL8195A Wi-Fi Module	Versions before 2020-04-21 (up to and excluding 2.08)

Weakness: CWE-121

References

https://www.vdoo.com/blog/realtek-rtl8195a-vulnerabilities-discovered/ x_refsource_CONFIRM