CVE-2020-26147

Name: CVE-2020-26147
Creator: NVD / NIST
Published: 2021-05-11T20:15:08.947+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.4/10EPSS 7.60%

Last modified Jun 17, 2026

CVE-2020-26147 is a medium-severity vulnerability rated 5.4/10 on the CVSS scale. An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments even though some of them were sent in plaintext. EPSS estimates a 7.60% chance of exploitation in the next 30 days.

Description

An issue was discovered in the Linux kernel 5.8.9. The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used.

Metrics

CVSS 3.1

5.4/10

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

EPSS Probability

7.60%

93.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 4.4, < 4.4.271
Linux	Linux Kernel	>= 4.9, < 4.9.271
Linux	Linux Kernel	>= 4.14, < 4.14.235
Linux	Linux Kernel	>= 4.19, < 4.19.193
Linux	Linux Kernel	>= 5.4, < 5.4.124
Linux	Linux Kernel	>= 5.10, < 5.10.42
Linux	Linux Kernel	>= 5.12, < 5.12.9
Debian	Debian Linux	9.0
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
Siemens	Scalance W1700 Ieee 802.11ac Firmware	All versions

References

http://www.openwall.com/lists/oss-security/2021/05/11/12Mailing List, Patch, 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://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlMailing List, Third 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.comProduct
http://www.openwall.com/lists/oss-security/2021/05/11/12Mailing List, Patch, 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://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing List, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlMailing List, Third 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.comProduct
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-2020-26147?

How severe is CVE-2020-26147?

CVE-2020-26147 has a CVSS score of 5.4/10 (MEDIUM severity). The EPSS model estimates a 7.60% probability of exploitation in the next 30 days.

How do I fix CVE-2020-26147?

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-2020-26147?

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

Scan your code now

Source: NVD / NIST