01 Record

CVE-2020-26143

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

UnratedPUBLISHEDCNA: mitre

CNA base scoreUnratedNo CNA CVSS vector

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02 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

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: 4.17% probability of exploitation activity in the next 30 days.
EPSS percentile: Equal to or higher than the score of 90.5% of scored records. A rank, not a probability.
NVD base score: 6.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Moderate. 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 19:36Z5 YR AGO

Last updated

2026-04-14 08:49Z6 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-20Improper Input ValidationClass
CWE-346Origin Validation ErrorClass

Data version

5.2

Document digest

4d3c98109146a2ec0c7fa760124d9bf7981c32a0e40ec546e496cf77bfb4239e

05 Affected products

VendorProductVersionsPlatforms

alfaawus036hNot specified—

alfaawus036h_firmwareNot specified—

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—

redhatenterprise_linuxNot 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
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
Not affected

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.