CVE-2021-44732

moderate-risk
Published 2021-12-20

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.

Do I need to act?

-
0.93% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
9
CVSS 9.8/10 Critical
NETWORK / LOW complexity

Affected Products (4)

Affected Vendors

Debian Arm

References (15)

Issue Tracking https://bugs.gentoo.org/829660
Release Notes 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
Mailing List https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
Exploit https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-...
Issue Tracking https://bugs.gentoo.org/829660
Release Notes 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
Mailing List https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html
https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html
Exploit https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-...
45
/ 100
moderate-risk
Severity 32/34 · Critical
Exploitability 3/34 · Minimal
Exposure 10/34 · Low