CVE-2021-43666

HIGH 7.5CVE-2021-43666 · Published 24/03/2022 · updated 17/06/2026

In short

CVE-2021-43666 is a HIGH (CVSS 7.5) vulnerability affecting mbed tls (arm).
Chance of exploitation in the next 30 days (EPSS): 2.1%, higher than 81.4% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
mbed tls arm	`≤ 3.0.0`	No fix yet

Description

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.

References

ARMmbed/mbedtls · Exploit
lists.debian.org/debian-lts-announce/2022/12/msg00036.html · Mailing List
lists.debian.org/debian-lts-announce/2025/06/msg00034.html

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Package

Affected versions

Patched versions

mbed tls

arm

≤ 3.0.0

No fix yet

More vulnerabilities in mbed tls

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