CVE-2020-26143

Name: CVE-2020-26143
Creator: NVD / NIST
Published: 2021-05-11T20:15:08.8+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 4.17%

Last modified Jun 17, 2026

CVE-2020-26143 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. An issue was discovered in the ALFA Windows 10 driver 1030.36.604 for AWUS036ACH. The WEP, WPA, WPA2, and WPA3 implementations accept fragmented plaintext frames in a protected Wi-Fi network. EPSS estimates a 4.17% chance of exploitation in the next 30 days.

Description

An issue was discovered in the ALFA Windows 10 driver 1030.36.604 for AWUS036ACH. The WEP, WPA, WPA2, and WPA3 implementations accept fragmented 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

4.17%

89.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Alfa	Awus036h Firmware	1030.36.604
Arista	C-75 Firmware	All versions
Arista	O-90 Firmware	All versions
Arista	C-65 Firmware	All versions
Arista	W-68 Firmware	All versions
Siemens	Scalance W700 Ieee 802.11n Firmware	All versions

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-2020-26143?

How severe is CVE-2020-26143?

CVE-2020-26143 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 4.17% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26143?

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-2020-26143?

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

Scan your code now

Source: NVD / NIST