CVE-2020-26143: alfa awus036h_firmware Improper Input Validation
CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2020-26143
Published 11-05-2021Last modified 14-04-2026
Vulnerability summary
CVE-2020-26143 is a medium (CVSS 6.5) Improper Input Validation vulnerability in alfa awus036h_firmware. EPSS estimates a 4.17% chance of exploitation in the next 30 days, higher than 90.7% of scored vulnerabilities.
CVSS score
6.5/10
010
Medium · v3.1 (NVD)EPSS score
4.17%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 2Timeline
- 11-05-2021PublishedVulnerability first disclosed.
- 14-04-2026Last modifiedVulnerability information updated.
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 adversary can abuse this to inject arbitrary data frames independent of the network configuration.
CVSS metrics
3 scores · 2 sources · 2 versionsMedium 6.5Preferred score · NVD (NIST)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:NSourcesAll 2 agree
- OSV · UbuntuEcosystem advisory · calculated6.5MediumCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Low 3.3Preferred score · NVD (NIST)
AV:A/AC:L/Au:N/C:N/I:P/A:NSourcesSingle source
EPSS trend
Probability
4.17%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
0.00 pp
From 4.17% on 19-09-2026
19-09-202619-10-2026
EPSS score4.17%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu170 products
- linuxAll versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Arista4 products
Alfa1 product
- awus036h_firmware1030.36.604
3 vendors · 175 products
References
12 links- tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-wifi-faf-22epcEWuVendor AdvisoryX Refsource CISCOThird Party Advisory
- www.arista.com/en/support/advisories-notices/security-advisories/12602-security-advisory-63X Refsource MISCThird Party Advisory