What is CVE-2020-25853?

CVE-2020-25853 is a vulnerability in the Realtek RTL8195A Wi-Fi Module that allows for a stack buffer over-read due to a lack of validation in the CheckMic() function.

How severe is CVE-2020-25853?

CVE-2020-25853 has a severity rating of 7.5, which is considered high.

How can CVE-2020-25853 be exploited?

CVE-2020-25853 can be exploited by an attacker to perform a stack buffer over-read.

What software versions are affected by CVE-2020-25853?

CVE-2020-25853 affects Realtek RTL8195A Wi-Fi Module firmware versions up to and excluding 2.08.

Is Realtek RTL8195A vulnerable to CVE-2020-25853?

No, the Realtek RTL8195A itself is not vulnerable to CVE-2020-25853.

Is there a fix available for CVE-2020-25853?

Yes, fixes for CVE-2020-25853 were released in versions of the Realtek RTL8195A Wi-Fi Module firmware starting from April 2020 (versions released after 2.08).

What is the Common Weakness Enumeration (CWE) for CVE-2020-25853?

CVE-2020-25853 is associated with CWE-125: Out-of-bounds Read and CWE-126: Buffer Over-read.

Vulnerability/
CVE-2020-25853

high

7.5

CWE

125 126

3/2/2021

4/8/2024

CVE-2020-25853

First published: Wed Feb 03 2021(Updated: )

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.

Credit: vuln@vdoo.com

Affected Software	Affected Version	How to fix
Realtek Rtl8195a Firmware	<2.08
Realtek RTL8195A

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Reference Links

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

Frequently Asked Questions

What is CVE-2020-25853?
CVE-2020-25853 is a vulnerability in the Realtek RTL8195A Wi-Fi Module that allows for a stack buffer over-read due to a lack of validation in the CheckMic() function.
How severe is CVE-2020-25853?
CVE-2020-25853 has a severity rating of 7.5, which is considered high.
How can CVE-2020-25853 be exploited?
CVE-2020-25853 can be exploited by an attacker to perform a stack buffer over-read.
What software versions are affected by CVE-2020-25853?
CVE-2020-25853 affects Realtek RTL8195A Wi-Fi Module firmware versions up to and excluding 2.08.
Is Realtek RTL8195A vulnerable to CVE-2020-25853?
No, the Realtek RTL8195A itself is not vulnerable to CVE-2020-25853.
Is there a fix available for CVE-2020-25853?
Yes, fixes for CVE-2020-25853 were released in versions of the Realtek RTL8195A Wi-Fi Module firmware starting from April 2020 (versions released after 2.08).
What is the Common Weakness Enumeration (CWE) for CVE-2020-25853?
CVE-2020-25853 is associated with CWE-125: Out-of-bounds Read and CWE-126: Buffer Over-read.

collector/nvd-index
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agent/author
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agent/last-modified-date
agent/description
agent/first-publish-date
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vendor/realtek
canonical/realtek rtl8195a firmware
canonical/realtek rtl8195a

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