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Vulnerability record · CVE-2021-44732 · published 20 December 2021

CVE-2021-44732: Arm mbed tls double free vulnerability

Arm · Mbed Tls

Mbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtls_ssl_set_session() failure.

9.8 CVSS 3.1 Critical EPSS 2.6% · top 15.4% CWE-415 · Double free
9.8CVSS 3.1 base score, v2 7.5
2.6%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
15References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

Mbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtls_ssl_set_session() failure.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugs.gentoo.org/829660 Issue TrackingMailing ListThird Party Advisory
https://github.com/ARMmbed/mbedtls/releases Release Notes
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.12 Release Notes
https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0 Release Notes
https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0 Release Notes
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html Mailing ListThird Party Advisory
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-12 ExploitMitigationThird Party Advisory
https://bugs.gentoo.org/829660 Issue TrackingMailing ListThird Party Advisory
https://github.com/ARMmbed/mbedtls/releases Release Notes
https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.12 Release Notes
https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0 Release Notes
https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0 Release Notes
https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html Mailing ListThird Party Advisory
https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html
https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-12 ExploitMitigationThird Party Advisory

Track CVE-2021-44732 inside VULONE

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Source: NIST National Vulnerability Database (record CVE-2021-44732), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.