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No exploitation reportedFix available

CVE-2021-44732

No exploitation reported by the sources we read.

  • Published2021-12-20
  • Fixed in2.28.0 · 2.16.12
  • WeaknessCWE-415

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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

dates in UTC
  1. 2021-12-2008:15CVE publishedNVD

Versions per branch

NVD
Arm mbed tls
BranchAffectedFixed in
2.x≥ 2.17.0, < 2.28.02.28.0
2.16< 2.16.122.16.12
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
Trustedfirmware mbed tls
BranchAffectedFixed in
3.0= 3.0.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mbedtlsUbuntu:Pro:24.04:LTSall versions · fixed in 2.28.8-1ubuntu0.1~esm1
  • mbedtlsUbuntu:Pro:22.04:LTSall versions · fixed in 2.28.0-1ubuntu0.1~esm1
  • mbedtlsUbuntu:Pro:20.04:LTSall versions · fixed in 2.16.4-1ubuntu2+esm1
  • mbedtlsUbuntu:Pro:18.04:LTSall versions · fixed in 2.8.0-1ubuntu0.1~esm1
  • mbedtlsUbuntu:16.04:LTSall versions · no fixed version listed
  • mbedtlsMageia:8all versions · fixed in 2.16.12-1.mga8
  • mbedtlsDebian:14all versions · fixed in 2.28.0-0.3
  • mbedtlsDebian:13all versions · fixed in 2.28.0-0.3

17 more package ranges on OSV.dev

Vendor advisories

  • CVE-2021-44732 Red Hat Product Security

    mbedtls: potential double-free after an out of memory error

Full record on NVD

Fix

  1. Update Arm mbed tls to 2.28.0 · 2.16.12

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2021-12-20
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-7g56-f7p4-fmcq

Frequently asked questions

What is 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.

Is CVE-2021-44732 actively exploited?

Active exploitation of CVE-2021-44732 has not been confirmed. Its EPSS score was 2.8% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-44732?

CVE-2021-44732 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record