CVE-2021-44732

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Summary

CVECVE-2021-44732
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2021-12-20 08:15:06 UTC
Updated2026-06-05 19:38:32 UTC
DescriptionMbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtls_ssl_set_session() failure.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

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

Problem Types: CWE-415 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
2.0[email protected]Primary7.5AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Low
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Arm Mbed Tls All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
Release Mbed TLS 2.28.0 · ARMmbed/mbedtls · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Release Notes
[SECURITY] [DLA 3249-1] mbedtls security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
Release Mbed TLS 3.1.0 · ARMmbed/mbedtls · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Release Notes
Potential double-free after an out of memory error - Tech Updates - Mbed TLS (Previously PolarSSL) af854a3a-2127-422b-91ae-364da2661108 tls.mbed.org Exploit, Mitigation, Third Party Advisory
Releases · ARMmbed/mbedtls · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Release Notes
Release Mbed TLS 2.16.12 · ARMmbed/mbedtls · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Release Notes
829660 – (CVE-2021-44732) net-libs/mbedtls: multiple vulnerabilities af854a3a-2127-422b-91ae-364da2661108 bugs.gentoo.org Issue Tracking, Mailing List, Third Party Advisory
lists.debian.org/debian-lts-announce/2025/06/msg00034.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 181446 Debian Security Update for mbedtls (DLA 3249-1)
  • 184355 Debian Security Update for mbedtls (CVE-2021-44732)
  • 500394 Alpine Linux Security Update for mbedtls
  • 504152 Alpine Linux Security Update for mbedtls
  • 690761 Free Berkeley Software Distribution (FreeBSD) Security Update for mbed Transport Layer Security (TLS) (c1b2b492-6999-11ec-a50c-001cc0382b2f)
  • 710702 Gentoo Linux Mbed Transport Layer Security (TLS) Multiple Vulnerabilities (GLSA 202301-08)
  • 904896 Common Base Linux Mariner (CBL-Mariner) Security Update for fluent-bit (12328)
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