CVE-2021-44732

critical

Published 2021-12-20 · Modified 2026-06-05

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CVSS v3

9.8

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

CVSS v4 NEW

—

not yet in upstream

VIR risk

9.8

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.

Predictions

Exploit likelihood

97%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

Debian Mixed 6 releases

Version	Status	Fixed in
trixie	Fixed	`2.28.0-0.3`
sid	Fixed	`2.28.0-0.3`
forky	Fixed	`2.28.0-0.3`
bullseye	Fixed	`2.16.9-0.1+deb11u1`
bookworm	Fixed	`2.28.0-0.3`
10.0	Affected	—

Application impact

Vendor	Product	Versions	Fixed
arm	mbed_tls	`{"endExcluding":"2.16.12"}`	`2.16.12`
arm	mbed_tls	`{"startIncluding":"2.17.0","endExcluding":"2.28.0"}`	`2.28.0`
trustedfirmware	mbed_tls	`3.0.0`

References

CWEs

CWE-415

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.