ARM mbed TLS up to 3.0.0 Password Length mbedtls_pkcs12_derivation denial of service

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in ARM mbed TLS up to 3.0.0. This affects the function mbedtls_pkcs12_derivation of the component Password Length Handler. Such manipulation leads to denial of service. This vulnerability is traded as CVE-2021-43666. The attack may be launched remotely. Furthermore, there is an exploit available. It is advisable to implement a patch to correct this issue.

Detailsinfo

A vulnerability was found in ARM mbed TLS up to 3.0.0 and classified as problematic. Affected by this issue is the function mbedtls_pkcs12_derivation of the component Password Length Handler. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability.

The weakness was shared 03/25/2022 as 5136. The advisory is shared for download at github.com. This vulnerability is handled as CVE-2021-43666 since 11/15/2021. Technical details as well as a public exploit are known. The MITRE ATT&CK project declares the attack technique as T1499.

The exploit is available at github.com. It is declared as proof-of-concept. The vulnerability scanner Nessus provides a plugin with the ID 240979 (Debian dla-4236 : libmbedcrypto3 - security update), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem.

The vulnerability is also documented in the vulnerability database at Tenable (240979). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.4
VulDB Meta Temp Score: 6.1

VulDB Base Score: 5.3
VulDB Temp Score: 4.8
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 240979
Nessus Name: Debian dla-4236 : libmbedcrypto3 - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/15/2021 🔍
03/25/2022 +130 days 🔍
03/25/2022 +0 days 🔍
11/04/2025 +1320 days 🔍

Sourcesinfo

Advisory: 5136
Status: Confirmed

CVE: CVE-2021-43666 (🔍)
GCVE (CVE): GCVE-0-2021-43666
GCVE (VulDB): GCVE-100-195764
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/25/2022 07:22
Updated: 11/04/2025 12:56
Changes: 03/25/2022 07:22 (43), 03/27/2022 09:24 (1), 03/27/2022 09:25 (1), 07/01/2025 04:44 (16), 11/04/2025 12:56 (19)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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