Critical
Security advisory
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2021-44732
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 08:58 UTC · Revision 1
Source evidence
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.
osv:CVE-2021-44732
Complete source record
{
"id": "a6777a3bf7273112aa2200e3eeb3338bb1d4ba0cb0162ae2261a65b46f78ddfc",
"url": "https://osv.dev/vulnerability/CVE-2021-44732",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "CVE-2021-44732",
"summary": "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.",
"evidence": "osv:CVE-2021-44732",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2021-44732",
"aliases": [
"CVE-2021-44732"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/Mbed-TLS/mbedtls",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "cf4667126010c665341f9e50ef691b7ef8294188"
},
{
"introduced": "3f8d78411a26e833db18d9fbde0e2f0baeda87f0"
},
{
"fixed": "8b3f26a5ac38d4fdccbc5c5366229f3e01dafcc0"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.16.12"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:arm:mbed_tls:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "2.17.0"
},
{
"fixed": "2.28.0"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v2.26.0",
"mbedtls-2.26.0",
"v2.16.10",
"mbedtls-2.16.10",
"v2.16.9",
"mbedtls-2.16.9",
"v2.24.0",
"mbedtls-2.24.0",
"v2.16.8",
"mbedtls-2.16.8",
"mbedtls-2.19.1",
"mbedtls-2.16.6",
"mbedtls-2.22.0d0",
"mbedtls-2.16.5",
"mbedtls-2.21.0",
"mbedtls-2.20.0",
"mbedtls-2.16.4",
"mbedtls-2.20.0d0",
"mbedtls-2.16.3",
"mbedtls-2.19.0d2",
"mbedtls-2.19.0",
"mbedtls-2.19.0d1",
"mbedtls-2.16.2",
"mbedtls-2.16.0",
"mbedtls-2.14.0",
"mbedtls-2.13.1",
"mbedtls-2.13.0",
"mbedtls-2.12.0",
"mbedtls-2.11.0",
"mbedtls-2.10.0",
"mbedtls-2.7.0",
"mbedtls-2.9.0",
"mbedtls-2.8.0",
"mbedtls-2.8.0-rc1",
"mbedtls-2.7.0-rc1",
"mbedtls-2.6.0",
"mbedtls-2.6.0-rc1",
"mbedtls-2.5.1",
"mbedtls-2.5.0",
"mbedtls-2.4.0",
"mbedtls-2.2.1",
"yotta-2.3.1",
"mbedtls-2.3.0",
"mbedtls-2.2.0",
"mbedos-release-15-11",
"mbedos-techcon-oob2",
"mbedtls-2.1.2",
"mbedtls-2.1.0",
"mbedtls-2.1.1",
"beta-oob-2",
"mbedtls-2.0.0",
"polarssl-1.3.9",
"polarssl-1.3.8",
"polarssl-1.3.7",
"polarssl-1.3.6",
"polarssl-1.3.5",
"polarssl-1.3.4",
"polarssl-1.3.3",
"polarssl-1.3.2",
"polarssl-1.3.1",
"polarssl-1.3.0",
"polarssl-1.3.0-rc0",
"polarssl-1.2.6",
"polarssl-1.2.5",
"polarssl-1.2.4",
"polarssl-1.2.2",
"polarssl-1.2.1",
"polarssl-1.2.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44732.json"
}
},
{
"ranges": [
{
"repo": "https://github.com/mbed-tls/mbedtls",
"type": "GIT",
"events": [
{
"introduced": "8df2f8e7b9c7bb9390ac74bb7bace27edca81a2b"
},
{
"last_affected": "8df2f8e7b9c7bb9390ac74bb7bace27edca81a2b"
},
{
"fixed": "cf4667126010c665341f9e50ef691b7ef8294188"
},
{
"fixed": "8b3f26a5ac38d4fdccbc5c5366229f3e01dafcc0"
},
{
"fixed": "d65aeb37349ad1a50e0f6c9b694d4b5290d60e49"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:trustedfirmware:mbed_tls:3.0.0:-:*:*:*:*:*:*",
"range": [
{
"introduced": "3.0.0-NA"
},
{
"last_affected": "3.0.0-NA"
}
],
"source": "CPE_STRING"
},
{
"range": [
{
"fixed": "cf4667126010c665341f9e50ef691b7ef8294188"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v2.16.12"
},
{
"range": [
{
"fixed": "8b3f26a5ac38d4fdccbc5c5366229f3e01dafcc0"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v2.28.0"
},
{
"range": [
{
"fixed": "d65aeb37349ad1a50e0f6c9b694d4b5290d60e49"
}
],
"source": "REFERENCES_TAG",
"original_tag": "v3.1.0"
}
]
}
}
],
"versions": [
"3.0.0-NA",
"v3.0.0",
"mbedtls-3.0.0"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44732.json"
}
}
],
"modified": "2026-10-24T10:51:25.865694060Z",
"provider": "osv",
"references": [
"https://lists.debian.org/debian-lts-announce/2025/06/msg00034.html",
"https://github.com/ARMmbed/mbedtls/releases",
"https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.12",
"https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0",
"https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0",
"https://lists.debian.org/debian-lts-announce/2022/12/msg00036.html",
"https://bugs.gentoo.org/829660",
"https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-12"
],
"provider_metadata": {
"unresolved_ranges": [
{
"cpes": [
"cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*"
],
"vendor_product": "debian:debian_linux",
"extracted_events": [
{
"range": [
{
"introduced": "10.0"
},
{
"last_affected": "10.0"
}
],
"source": "CPE_STRING"
}
]
},
{
"cpes": [
"cpe:2.3:a:trustedfirmware:mbed_tls:3.0.0:preview1:*:*:*:*:*:*"
],
"vendor_product": "trustedfirmware:mbed_tls",
"extracted_events": [
{
"range": [
{
"introduced": "3.0.0-preview1"
},
{
"last_affected": "3.0.0-preview1"
}
],
"source": "CPE_STRING"
}
]
}
]
}
},
"related_cves": [
{
"value": "CVE-2021-44732",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 442631,
"published_at": "2021-12-20T08:15:06.62+00:00"
}