01 Record

CVE-2020-26147

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

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

View raw JSON

02 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

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 7.60% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 94.5% of scored records. A rank, not a probability.
NVD base score: 5.4 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:L/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Low. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2021-05-11 19:40Z5 YR AGO

Last updated

2026-04-14 09:01Z6 MO AGO

Reserved

2020-09-29

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-307Improper Restriction of Excessive Authentication AttemptsBase

Data version

5.2

Document digest

bfe097e9612a447e17b2e9abb6075976dfa510a2cbc46fc31cff80f6d8d1cd21

05 Affected products

VendorProductVersionsPlatforms

aristac-65Not specified—

aristac-65_firmwareNot specified—

aristac-75Not specified—

aristac-75_firmwareNot specified—

aristao-90Not specified—

aristao-90_firmwareNot specified—

aristaw-68Not specified—

aristaw-68_firmwareNot specified—

debiandebian_linuxNot specified—

linuxlinux_kernelNot specified—

redhatenterprise_linuxNot specified—

siemensscalance_w1700_ieee_802.11acNot specified—

siemensscalance_w1700_ieee_802.11ac_firmwareNot specified—

siemensscalance_w700_ieee_802.11nNot specified—

siemensscalance_w700_ieee_802.11n_firmwareNot specified—

06 References

tools.cisco.com20210511 Multiple Vulnerabilities in Frame Aggregation and Fragmentation Implementations of 802.11 Specification Affecting Cisco Products: May 2021https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWuvendor-advisoryx_refsource_CISCO
www.fragattacks.comhttps://www.fragattacks.comx_refsource_MISC
github.comhttps://github.com/vanhoefm/fragattacks/blob/master/SUMMARY.mdx_refsource_MISC
www.openwall.com[oss-security] 20210511 various 802.11 security issues - fragattacks.comhttp://www.openwall.com/lists/oss-security/2021/05/11/12mailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20210623 [SECURITY] [DLA 2689-1] linux security updatehttps://lists.debian.org/debian-lts-announce/2021/06/msg00020.htmlmailing-listx_refsource_MLIST
lists.debian.org[debian-lts-announce] 20210623 [SECURITY] [DLA 2690-1] linux-4.19 security updatehttps://lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlmailing-listx_refsource_MLIST
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-913875.pdfx_refsource_CONFIRM
www.arista.comhttps://www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63x_refsource_MISC
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-913875.html
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/html/ssa-019200.html

07 Fixed in

AlmaLinux 8

kernel-tools-libs-devel
Fixed in 4.18.0-348.el8

Arch Linux

linux
Fixed in 5.12.9.arch1-1
linux-hardened
Fixed in 5.12.9.hardened1-1
linux-lts
Fixed in 5.10.42-1
linux-zen
Fixed in 5.12.9.zen1-1

Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.

CloudLinux 8

kernel-tools-libs-devel
Fixed in 4.18.0-348.el8

Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.

Debian 12

linux
Fixed in 5.10.46-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 5.10.46-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 5.10.46-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.