High severity7.5NVD Advisory· Published Mar 24, 2022· Updated Jun 17, 2026

CVE-2021-43666

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

Arm/MbedTLS
cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*
Range: <=3.0.0
Debian/linux
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
mbed TLS/mbed TLSdescription
ARMmbed/mbedtlsllm-fuzzy
Range: <=3.0.0

Patches

Vulnerability mechanics

References

github.com/ARMmbed/mbedtls/issues/5136nvdExploitIssue TrackingThird Party Advisory
lists.debian.org/debian-lts-announce/2022/12/msg00036.htmlnvdMailing ListThird Party Advisory
lists.debian.org/debian-lts-announce/2025/06/msg00034.htmlnvd

News mentions

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cvss	0.488
epss	0.002
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000