How severe is CVE-2020-26140?

CVE-2020-26140 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2020-26140 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-26140?

CVE-2020-26140 primarily affects Alfa Awus036h Firmware. In total, 204 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2020-26140?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-26140 published?

CVE-2020-26140 was published on 2021-05-11 and last updated on 2026-06-17.

CVE-2020-26140

CVE-2020-26140 is a medium-severity vulnerability in Alfa Awus036h Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 3.3
EPSS exploit prediction: 3% (85th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Alfa Awus036h Firmware
Published: 2021-05-11
Last modified: 2026-06-17

Description

An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.

Frequently asked questions

What is CVE-2020-26140?: An issue was discovered in the ALFA Windows 10 driver 6.1316.1209 for AWUS036H. The WEP, WPA, WPA2, and WPA3 implementations accept plaintext frames in a protected Wi-Fi network. An adversary can abuse this to inject arbitrary data frames independent of the network configuration.
How severe is CVE-2020-26140?: CVE-2020-26140 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2020-26140 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (85th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-26140?: CVE-2020-26140 primarily affects Alfa Awus036h Firmware. In total, 204 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2020-26140?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-26140 published?: CVE-2020-26140 was published on 2021-05-11 and last updated on 2026-06-17.

References

Affected products (204)

cpe:2.3:o:alfa:awus036h_firmware:6.1316.1209:*:*:*:*:windows_10:*:*
cpe:2.3:o:siemens:scalance_w1748-1_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w1750d_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_w1788-1_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w1788-2_firmware:-:*:*:*:*:*:eec_m12:*
cpe:2.3:o:siemens:scalance_w1788-2_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w1788-2ia_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w721-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w722-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w734-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w738-1_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w748-1_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w748-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w761-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w774-1_firmware:-:*:*:*:*:*:m12_eec:*
cpe:2.3:o:siemens:scalance_w774-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w778-1_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w778-1_firmware:-:*:*:*:*:*:m12_eec:*
cpe:2.3:o:siemens:scalance_w786-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w786-2_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w786-2_firmware:-:*:*:*:*:*:sfp:*
cpe:2.3:o:siemens:scalance_w786-2ia_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w788-1_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w788-1_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_w788-2_firmware:-:*:*:*:*:*:m12:*
cpe:2.3:o:siemens:scalance_w788-2_firmware:-:*:*:*:*:*:m12_eec:*
cpe:2.3:o:siemens:scalance_w788-2_firmware:-:*:*:*:*:*:rj45:*
cpe:2.3:o:siemens:scalance_wam763-1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_wam766-1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_wam766-1_firmware:-:*:*:*:*:*:eec:*
cpe:2.3:o:siemens:scalance_wam766-1_6ghz_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_wam766-1_6ghz_firmware:-:*:*:*:*:*:eec:*
cpe:2.3:o:siemens:scalance_wum763-1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_wum766-1_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_wum766-1_6ghz_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:arista:c-100_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:arista:c-110_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:arista:c-120_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:arista:c-130_firmware:-:*:*:*:*:*:*:*
cpe:2.3:o:arista:c-200_firmware:-:*:*:*:*:*:*:*

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