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CVE-2021-44732
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.
Critical9.8EPSS 2.8%
- Published
- Updated
- Reserved
- Assigned by
- mitre
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.
Timeline
ID reserved
By mitre
- 12 days later
· 12 days later
Published
- 4 years later
· 4 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 2.8% · top 14% of all CVEs (7 Nov 2026)
Loading the EPSS history…
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Weakness
Affected products
n/a
- affected n/a
References (8)
- https://github.com/ARMmbed/mbedtls/releases (opens in a new tab)x_transferred
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-12 (opens in a new tab)x_transferred
- https://bugs.gentoo.org/829660 (opens in a new tab)x_transferred
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.12 (opens in a new tab)x_transferred
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0 (opens in a new tab)x_transferred
- https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0 (opens in a new tab)x_transferred
- [debian-lts-announce] 20221225 [SECURITY] [DLA 3249-1] mbedtls security update (opens in a new tab)mailing-listx_transferred
- https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2021-44732)Record last updated .