CVE-2020-26140

Name: CVE-2020-26140
Creator: NVD / NIST
Published: 2021-05-11T20:15:08.687+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.92%

Last modified Jun 17, 2026

CVE-2020-26140 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 2.92% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

EPSS Probability

2.92%

85.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-327

Affected Software

Vendor	Product	Versions
Alfa	Awus036h Firmware	6.1316.1209
Siemens	Scalance W1748-1 Firmware	All versions
Siemens	Scalance W1750d Firmware	All versions
Siemens	Scalance W1788-1 Firmware	All versions
Siemens	Scalance W1788-2 Firmware	All versions
Siemens	Scalance W1788-2ia Firmware	All versions
Siemens	Scalance W721-1 Firmware	All versions
Siemens	Scalance W722-1 Firmware	All versions
Siemens	Scalance W734-1 Firmware	All versions
Siemens	Scalance W738-1 Firmware	All versions
Siemens	Scalance W748-1 Firmware	All versions
Siemens	Scalance W761-1 Firmware	All versions
Siemens	Scalance W774-1 Firmware	All versions
Siemens	Scalance W778-1 Firmware	All versions
Siemens	Scalance W786-1 Firmware	All versions
Siemens	Scalance W786-2 Firmware	All versions
Siemens	Scalance W786-2ia Firmware	All versions
Siemens	Scalance W788-1 Firmware	All versions
Siemens	Scalance W788-2 Firmware	All versions
Siemens	Scalance Wam763-1 Firmware	All versions
Siemens	Scalance Wam766-1 Firmware	All versions
Siemens	Scalance Wam766-1 6ghz Firmware	All versions
Siemens	Scalance Wum763-1 Firmware	All versions
Siemens	Scalance Wum766-1 Firmware	All versions
Siemens	Scalance Wum766-1 6ghz Firmware	All versions
Arista	C-100 Firmware	All versions
Arista	C-110 Firmware	All versions
Arista	C-120 Firmware	All versions
Arista	C-130 Firmware	All versions
Arista	C-200 Firmware	All versions
Arista	C-230 Firmware	All versions
Arista	C-235 Firmware	All versions
Arista	C-250 Firmware	All versions
Arista	C-260 Firmware	All versions
Arista	C-65 Firmware	All versions
Arista	C-75 Firmware	All versions
Arista	O-105 Firmware	All versions
Arista	O-90 Firmware	All versions
Arista	W-118 Firmware	All versions
Arista	W-68 Firmware	All versions
Cisco	1100 Firmware	All versions
Cisco	1100-4p Firmware	All versions
Cisco	1100-8p Firmware	All versions
Cisco	1101-4p Firmware	All versions
Cisco	1109-2p Firmware	All versions
Cisco	1109-4p Firmware	All versions
Cisco	Aironet 1532 Firmware	All versions
Cisco	Aironet 1542d Firmware	All versions
Cisco	Aironet 1542i Firmware	All versions
Cisco	Aironet 1552 Firmware	All versions

Showing 50 of 194 affected configurations. See NVD for the full list.

References

http://www.openwall.com/lists/oss-security/2021/05/11/12Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdfThird Party Advisory
https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.mdThird Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWuThird Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63Third Party Advisory
https://www.fragattacks.comThird Party Advisory
http://www.openwall.com/lists/oss-security/2021/05/11/12Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdfThird Party Advisory
https://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.mdThird Party Advisory
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWuThird Party Advisory
https://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63Third Party Advisory
https://www.fragattacks.comThird Party Advisory
https://cert-portal.siemens.com/productcert/html/ssa-019200.html
https://cert-portal.siemens.com/productcert/html/ssa-913875.html

Timeline

Published: May 11, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-26140?

How severe is CVE-2020-26140?

CVE-2020-26140 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.92% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26140?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-26140?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST