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Fencer Vulns
medium 6.5

CVE-2020-26143 json

An issue was discovered in the ALFA Windows 10 driver 1030.36.604 for AWUS036ACH.

published 2021-05-11 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-18770

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.2%
EPSS 4.2% chance of exploitation in 30 days, percentile 90%
public exploits
0
none known

Summary

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.

Patch / fix

  • Siemens SCALANCE W721-1 RJ45 V6.6.0
  • Siemens SCALANCE W722-1 RJ45 V6.6.0
  • Siemens SCALANCE W734-1 RJ45 V6.6.0
  • Siemens SCALANCE W734-1 RJ45 (USA) V6.6.0
  • Siemens SCALANCE W738-1 M12 V6.6.0
  • Siemens SCALANCE W748-1 M12 V6.6.0
  • Siemens SCALANCE W748-1 RJ45 V6.6.0
  • Siemens SCALANCE W761-1 RJ45 V6.6.0
  • Siemens SCALANCE W774-1 M12 EEC V6.6.0
  • Siemens SCALANCE W774-1 RJ45 V6.6.0
  • Siemens SCALANCE W774-1 RJ45 (USA) V6.6.0
  • Siemens SCALANCE W778-1 M12 V6.6.0
  • Siemens SCALANCE W778-1 M12 EEC V6.6.0
  • Siemens SCALANCE W778-1 M12 EEC (USA) V6.6.0
  • Siemens SCALANCE W786-1 RJ45 V6.6.0
  • Siemens SCALANCE W786-2 RJ45 V6.6.0
  • Siemens SCALANCE W786-2 SFP V6.6.0
  • Siemens SCALANCE W786-2IA RJ45 V6.6.0
  • Siemens SCALANCE W788-1 M12 V6.6.0
  • Siemens SCALANCE W788-1 RJ45 V6.6.0
  • Siemens SCALANCE W788-2 M12 V6.6.0
  • Siemens SCALANCE W788-2 M12 EEC V6.6.0
  • Siemens SCALANCE W788-2 RJ45 V6.6.0
  • kernel RHEL 8 4.18.0-348.el8
  • perf RHEL 8 4.18.0-348.el8
  • bpftool RHEL 8 4.18.0-348.el8
  • kernel-core RHEL 8 4.18.0-348.el8
  • kernel-tools RHEL 8 4.18.0-348.el8
  • python3-perf RHEL 8 4.18.0-348.el8
  • kernel-modules RHEL 8 4.18.0-348.el8
  • kernel-zfcpdump RHEL 8 4.18.0-348.el8

red hat advisories RHSA-2021:4356RHSA-2021:4140

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-26143 updated cvss 6.5

kernel: accepting fragmented plaintext frames in protected networks

  • Red Hat Enterprise Linux 5 kernel Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, kernel-alt, python-perf, +9 more
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat CodeReady Linux Builder (v. 8) kernel-debuginfo-common-x86_64 4.18.0-348.el8, kernel-debuginfo-common-aarch64 4.18.0-348.el8, kernel-debuginfo-common-ppc64le 4.18.0-348.el8 Red Hat Enterprise Linux BaseOS (v. 8) perf 4.18.0-348.el8, kernel 4.18.0-348.el8, bpftool 4.18.0-348.el8, kernel-core 4.18.0-348.el8, kernel-tools 4.18.0-348.el8, python3-perf 4.18.0-348.el8, +15 more
    fixed: vendor fix RHSA-2021:4356
  • Red Hat Enterprise Linux Real Time (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, kernel-rt-debug-modules 4.18.0-348.rt7.130.el8, kernel-rt-modules-extra 4.18.0-348.rt7.130.el8, +2 more Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt 4.18.0-348.rt7.130.el8, kernel-rt-kvm 4.18.0-348.rt7.130.el8, kernel-rt-core 4.18.0-348.rt7.130.el8, kernel-rt-modules 4.18.0-348.rt7.130.el8, kernel-rt-debug-kvm 4.18.0-348.rt7.130.el8, kernel-rt-debug-core 4.18.0-348.rt7.130.el8, +4 more
    fixed: vendor fix RHSA-2021:4140
  • Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +82 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-111-07 updated cvss 6.5

Siemens SCALANCE

  • Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AC0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA0) < 6.6.0
    +34 more products
    Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (USA) (6GK5734-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TA0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AC0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (USA) (6GK5774-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (6GK5778-1GY00-0TA0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (USA) (6GK5778-1GY00-0TB0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AC0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AB0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 RJ45 (6GK5788-1FC00-0AA0) < 6.6.0
    affected: fixed in V6.6.0, mitigation support.industry.siemens.com

9 more affected in the full advisory

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-22-104-04 updated cvss 6.5

Siemens SCALANCE FragAttacks

  • Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W721-1 RJ45 (6GK5721-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W722-1 RJ45 (6GK5722-1FC00-0AC0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA0) < 6.6.0
    +34 more products
    Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (6GK5734-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W734-1 RJ45 (USA) (6GK5734-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W738-1 M12 (6GK5738-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 M12 (6GK5748-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W748-1 RJ45 (6GK5748-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W761-1 RJ45 (6GK5761-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TA0) < 6.6.0 Siemens SCALANCE W774-1 M12 EEC (6GK5774-1FY00-0TB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AA6) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AB0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (6GK5774-1FX00-0AC0) < 6.6.0 Siemens SCALANCE W774-1 RJ45 (USA) (6GK5774-1FX00-0AB6) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AA0) < 6.6.0 Siemens SCALANCE W778-1 M12 (6GK5778-1GY00-0AB0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (6GK5778-1GY00-0TA0) < 6.6.0 Siemens SCALANCE W778-1 M12 EEC (USA) (6GK5778-1GY00-0TB0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-1 RJ45 (6GK5786-1FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AB0) < 6.6.0 Siemens SCALANCE W786-2 RJ45 (6GK5786-2FC00-0AC0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AA0) < 6.6.0 Siemens SCALANCE W786-2 SFP (6GK5786-2FE00-0AB0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AA0) < 6.6.0 Siemens SCALANCE W786-2IA RJ45 (6GK5786-2HC00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AA0) < 6.6.0 Siemens SCALANCE W788-1 M12 (6GK5788-1GD00-0AB0) < 6.6.0 Siemens SCALANCE W788-1 RJ45 (6GK5788-1FC00-0AA0) < 6.6.0
    affected: fixed in V6.6.0, mitigation support.industry.siemens.com

9 more affected in the full advisory

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

cisa ICSA-22-102-04 updated cvss 6.5

Mitsubishi Electric GT25-WLAN

  • Mitsubishi Electric GT25-WLAN <= 01.39.000
    affected: mitigation “For users who use the affected products and versions, please update to the fixed versions” mitsubishielectric.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

cisa ICSA-21-236-01 updated cvss 6.5

Hitachi ABB Power Grids TropOS

  • Hitachi Energy TropOS <= 8.9.4.8
    affected: vendor fix, mitigation “Where Wi-Fi access is required, wherever possible ensure physical access to the local area is restricted to approved staff only.” search.abb.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

4.17% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
NVD 2.0 3.3 AV:A/AC:L/Au:N/C:N/I:P/A:N

Affected products

  • Siemens SCALANCE W721-1 RJ45
  • Siemens SCALANCE W722-1 RJ45
  • Siemens SCALANCE W734-1 RJ45
  • Siemens SCALANCE W734-1 RJ45 (USA)
  • Siemens SCALANCE W738-1 M12
  • Siemens SCALANCE W748-1 M12
  • Siemens SCALANCE W748-1 RJ45
  • Siemens SCALANCE W761-1 RJ45
  • Siemens SCALANCE W774-1 M12 EEC
  • Siemens SCALANCE W774-1 RJ45
  • Siemens SCALANCE W774-1 RJ45 (USA)
  • Siemens SCALANCE W778-1 M12
  • Siemens SCALANCE W778-1 M12 EEC
  • Siemens SCALANCE W778-1 M12 EEC (USA)
  • Siemens SCALANCE W786-1 RJ45
  • Siemens SCALANCE W786-2 RJ45
  • Siemens SCALANCE W786-2 SFP
  • Siemens SCALANCE W786-2IA RJ45
  • Siemens SCALANCE W788-1 M12
  • Siemens SCALANCE W788-1 RJ45
  • Siemens SCALANCE W788-2 M12
  • Siemens SCALANCE W788-2 M12 EEC
  • Siemens SCALANCE W788-2 RJ45

Classification

Weakness
  • CWE-20 Improper Input Validation

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.