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CVE-2020-25853

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-02-03 · updated 2026-06-17
• Weakness: CWE-126

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.

Affected products

• Realtek RTL8195A Wi-Fi Module: before 2.08 — fixed in 2.08

How to fix

Upgrade to a fixed version: Realtek RTL8195A Wi-Fi Module 2.08. Check the vendor advisory for mitigations.

References

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

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