CVE-2021-43666 - Vulnerability Details - OpenCVE

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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

Key SSVC decision points have not yet been added.

Vendors	Products
Arm	Mbed Tls
Debian	Debian Linux

Configuration 1 [-]

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

Configuration 2 [-]

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

No data.

References

Link	Providers
https://github.com/ARMmbed/mbedtls/issues/5136
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html

History

Mon, 03 Nov 2025 20:30:00 +0000

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

Mon, 14 Jul 2025 13:45:00 +0000

Type	Values Removed	Values Added
Metrics	epss `{'score': 0.00179}`	epss `{'score': 0.00111}`

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2022-03-24T00:00:00.000Z

Updated: 2025-11-03T19:26:30.089Z

Reserved: 2021-11-15T00:00:00.000Z

Link: CVE-2021-43666

Vulnrichment

No data.

NVD

Status : Modified

Published: 2022-03-24T18:15:08.333

Modified: 2025-11-03T20:15:51.127

Link: CVE-2021-43666

Redhat

No data.

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*", "matchCriteriaId": "C992D1BD-86E2-4408-B0BA-C977F6B2A7CB", "versionEndIncluding": "3.0.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*", "matchCriteriaId": "07B237A9-69A3-4A9C-9DA0-4E06BD37AE73", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "Se presenta una vulnerabilidad de denegaci\u00f3n de servicio en mbed TLS 3.0.0 y anteriores, en la funci\u00f3n mbedtls_pkcs12_derivation cuando la longitud de una contrase\u00f1a de entrada es 0"}], "id": "CVE-2021-43666", "lastModified": "2025-11-03T20:15:51.127", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "MEDIUM", "cvssData": {"accessComplexity": "LOW", "accessVector": "NETWORK", "authentication": "NONE", "availabilityImpact": "PARTIAL", "baseScore": 5.0, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 10.0, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": false}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2022-03-24T18:15:08.333", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://github.com/ARMmbed/mbedtls/issues/5136"}, {"source": "cve@mitre.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Issue Tracking", "Third Party Advisory"], "url": "https://github.com/ARMmbed/mbedtls/issues/5136"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}