Cyber Resilience

CVE-2021-44732

CriticalPublic PoCUpdated

Published: 20 December 2021

Published
20 December 2021
Modified
05 June 2026
KEV Added
Patch
CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0138 80.7th percentile
Risk Priority 20 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-44732 is a critical-severity Double Free (CWE-415) vulnerability in Arm Mbed Tls. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 19.3% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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.

CWE(s)

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

arm
mbed tls
≤ 2.16.12 · 2.17.0 — 2.28.0
trustedfirmware
mbed tls
3.0.0
debian
debian linux
10.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References