CVE-2020-26140 Security feature bypass in n/a

Medium 6.5 Published 11 May 2021 Updated 8 Oct 2026

The ALFA Wi-Fi driver accepts plaintext frames in protected networks, allowing attackers to inject arbitrary data frames regardless of network configuration.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2020-26140?

CVE-2020-26140 is a medium-severity vulnerability in Siemens Scalance W1750d Firmware, published on 11 May 2021. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.

Weakness: CWE-327

Which versions are affected by CVE-2020-26140?

It affects 194 products.

Products include Alfa Awus036h Firmware, Arista C-100 Firmware, Arista C-110 Firmware, Arista C-120 Firmware, Arista C-130 Firmware, Arista C-200 Firmware and 188 more.

How do I fix CVE-2020-26140?

Upgrade to a fixed version.

Is CVE-2020-26140 being exploited?

There is no known exploitation of CVE-2020-26140 in the wild and no public exploit code.

All Siemens Scalance W1750d Firmware vulnerabilities

Sources

Also known as GHSA-px4f-q3pw-j682, ROOT-OS-UBUNTU-2204-CVE-2020-26140, UBUNTU-CVE-2020-26140.