CVE-2021-43666HighMicrosoft CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Microsoft advisory for CVE-2021-43666

Published
September 4, 2025
Last Modified
—

🔗 CVE IDs covered (1)

CVE-2021-43666 →

📋 Microsoft's advisory

EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-43666. This page also shows what EchelonGraph holds for CVE-2021-43666, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.

🎯 Affected products2

  • azl3 qemu 8.2.0-16 on Azure Linux 3.0
  • cbl2 qemu 6.2.0-24 on CBL Mariner 2.0

🧭 EchelonGraph on CVE-2021-43666

EchelonGraph score
7.5 HIGH
CISA KEV
Not listed
Fix status
A fix is available — apply it.

Description from the CVE record (CVE.org), as published by its numbering authority

A Denial of Service vulnerability exists in mbed TLS 3.0.0 and earlier in the mbedtls_pkcs12_derivation function when an input password's length is 0.

Published by MITRE Corporation, the CVE Numbering Authority that assigned CVE-2021-43666, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).

🔗 References (1)