ARM mbed TLS up to 2.16.11/2.27.x/3.0.0 mbedtls_ssl_set_session double free

CVSS Meta Temp Score
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CTI Interest Score
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7.5$0-$5k0.00

Summaryinfo

A vulnerability was found in ARM mbed TLS up to 2.16.11/2.27.x/3.0.0. It has been classified as critical. This issue affects the function mbedtls_ssl_set_session. The manipulation leads to double free. This vulnerability is listed as CVE-2021-44732. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability was found in ARM mbed TLS up to 2.16.11/2.27.x/3.0.0 and classified as critical. This issue affects the function mbedtls_ssl_set_session. The manipulation with an unknown input leads to a double free vulnerability. Using CWE to declare the problem leads to CWE-415. The product calls free() twice on the same memory address, potentially leading to modification of unexpected memory locations. Impacted is confidentiality, integrity, and availability.

The weakness was presented 12/20/2021. The advisory is shared at bugs.gentoo.org. The identification of this vulnerability is CVE-2021-44732 since 12/08/2021. Technical details are known, but no exploit is available.

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.

Upgrading to version 2.16.12, 2.28.0, 3.0.1 or 3.1.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

The vulnerability is also documented in the vulnerability database at Tenable (240979). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.6
VulDB Meta Temp Score: 7.6

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
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: Double free
CWE: CWE-415 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: mbed TLS 2.16.12/2.28.0/3.0.1/3.1.0

Timelineinfo

12/08/2021 🔍
12/20/2021 +12 days 🔍
12/20/2021 +0 days 🔍
11/04/2025 +1415 days 🔍

Sourcesinfo

Advisory: bugs.gentoo.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-44732 (🔍)
GCVE (CVE): GCVE-0-2021-44732
GCVE (VulDB): GCVE-100-188753

Entryinfo

Created: 12/20/2021 12:47
Updated: 11/04/2025 10:37
Changes: 12/20/2021 12:47 (41), 12/24/2021 22:28 (1), 07/01/2025 04:44 (16), 11/04/2025 10:37 (19)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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