CVE-2021-43666

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.

CVSS v3 7.5 HIGH
CVSS v2.0 5.0 MEDIUM

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

5.0^/10

CVSS v2.0 : MEDIUM

Vector : AV:N/AC:L/Au:N/C:N/I:N/A:P

Exploitability : 10.0 / Impact : 2.9

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact PARTIAL

References

Link	Resource
https://github.com/ARMmbed/mbedtls/issues/5136	Exploit Issue Tracking Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html	Mailing List Third Party Advisory
https://github.com/ARMmbed/mbedtls/issues/5136	Exploit Issue Tracking Third Party Advisory
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html	Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html

Configurations

Configuration 1 (hide)

cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

History

02 Dec 2025, 21:15

Type	Values Removed	Values Added
CWE		CWE-130

03 Nov 2025, 20:15

Type	Values Removed	Values Added
References		() https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html -

Information

Published : 2022-03-24 18:15

Updated : 2025-12-02 21:15

NVD link : CVE-2021-43666

Mitre link : CVE-2021-43666

CVE.ORG link : CVE-2021-43666

JSON object : View

Products Affected

debian

debian_linux

arm

mbed_tls

CWE

NVD-CWE-noinfo CWE-130

Improper Handling of Length Parameter Inconsistency

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