Is CVE-2021-44732 in the CISA KEV catalog?

No. CVE-2021-44732 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-44732?

CVE-2021-44732 has a CVSS v3 base score of 9.8 (CRITICAL).

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

CVE-2021-44732 has an EPSS score of 2.57% (83th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-44732?

Upgrade mbedtls on debian 11 to 2.16.9-0.1+deb11u1 or later. Fixes are available for 14 affected products.

CVE & CISA-KEV Catalog

CVE-2021-44732

CRITICALEPSS 83th pctl

9.8

CVSS v3

NVD

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.

CWE-415

How to fix

Remediation Available

mbedtlsDebian

Fixed in:2.16.9-0.1+deb11u1CVE-2021-44732

Fixed in:2.28.0-0.3CVE-2021-44732

libmbedcrypto1Ubuntu

Fixed in:2.8.0-1ubuntu0.1~esm1USN-8123-1

libmbedcrypto3Ubuntu

Fixed in:2.16.4-1ubuntu2+esm1USN-8123-1

libmbedcrypto7Ubuntu

Fixed in:2.28.0-1ubuntu0.1~esm1USN-8123-1

libmbedcrypto7t64Ubuntu

Fixed in:2.28.8-1ubuntu0.1~esm1USN-8123-1

libmbedtls-devUbuntu

Fixed in:2.8.0-1ubuntu0.1~esm1USN-8123-1

Fixed in:2.16.4-1ubuntu2+esm1USN-8123-1

Fixed in:2.28.0-1ubuntu0.1~esm1USN-8123-1

Fixed in:2.28.8-1ubuntu0.1~esm1USN-8123-1

libmbedtls10Ubuntu

Fixed in:2.8.0-1ubuntu0.1~esm1USN-8123-1

libmbedtls12Ubuntu

Fixed in:2.16.4-1ubuntu2+esm1USN-8123-1

libmbedtls14Ubuntu

Fixed in:2.28.0-1ubuntu0.1~esm1USN-8123-1

libmbedtls14t64Ubuntu

Fixed in:2.28.8-1ubuntu0.1~esm1USN-8123-1

libmbedx509-0Ubuntu

Fixed in:2.8.0-1ubuntu0.1~esm1USN-8123-1

Fixed in:2.16.4-1ubuntu2+esm1USN-8123-1

libmbedx509-1Ubuntu

Fixed in:2.28.0-1ubuntu0.1~esm1USN-8123-1

libmbedx509-1t64Ubuntu

Fixed in:2.28.8-1ubuntu0.1~esm1USN-8123-1

mbedtlsUbuntu

Fixed in:2.8.0-1ubuntu0.1~esm1USN-8123-1

Fixed in:2.16.4-1ubuntu2+esm1USN-8123-1

Fixed in:2.28.0-1ubuntu0.1~esm1USN-8123-1

Fixed in:2.28.8-1ubuntu0.1~esm1USN-8123-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Exploit Intelligence

2.57%probability of exploitation in 30 days

83rdpercentile

Elevated risk: more likely to be exploited than 83% of all known CVEs.

References

Exploit1

tls.mbed.org

Third-Party Advisory2

Release Notes4

Other references1

lists.debian.org

Related Vulnerabilities

Other CWE-415 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-25136	Medium	6.5	90%	-	Fix
CVE-2018-0101	Critical	10.0	87%	-	Fix
CVE-2003-0545	Critical	9.8	85%	-	Fix
CVE-2019-3829	Medium	5.3	59%	-	Fix
CVE-2026-33824	Critical	9.8	56%	-	Fix
CVE-2021-3407	Medium	5.5	50%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-06-05.