CVE catalog

CVE-2020-36422

mbedtls affected and fixed versions

An issue was discovered in Arm Mbed TLS before 2.23.0. A side channel allows recovery of an ECC private key, related to mbedtls_ecp_check_pub_priv, mbedtls_pk_parse_key, mbedtls_pk_parse_keyfile, mbedtls_ecp_mul, and mbedtls_ecp_mul_restartable.

Severity: Medium
Published: Jul 19, 2021, 5:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.26% · Oct 27, 2026

Projects and upstream resources

[mbedtls][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debiantrixie	mbedtls	`3.6.6-0.1~deb13u1`	Fixed	[CVE-2020-36422]
Debiansid	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debiansid	mbedtls	`3.6.7-3`	Fixed	[CVE-2020-36422]
Debianforky	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debianforky	mbedtls	`3.6.7-3`	Fixed	[CVE-2020-36422]
Debianbookworm	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debianbookworm	mbedtls	`2.28.3-1`	Fixed	[CVE-2020-36422]

Showing 8 fix observations. All 20 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	mbedtls	`2.16.9-0.1`	UnknownSource applicability is not established	Provider not reported
Debianbookworm	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debianbookworm	mbedtls	`2.28.3-1`	Fixed	[CVE-2020-36422]
Debianforky	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debianforky	mbedtls	`3.6.7-3`	Fixed	[CVE-2020-36422]
Debiansid	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debiansid	mbedtls	`3.6.7-3`	Fixed	[CVE-2020-36422]
Debiantrixie	mbedtls	`2.16.9-0.1`	FixedDistribution-reported fixed boundary	[CVE-2020-36422]
Debiantrixie	mbedtls	`3.6.6-0.1~deb13u1`	Fixed	[CVE-2020-36422]
Ubuntu16.04	mbedtls	`2.1.2-1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntu16.04	mbedtls	`2.2.0-1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntu16.04	mbedtls	`2.2.1-1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntu16.04	mbedtls	`2.2.1-2`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntu16.04	mbedtls	`2.2.1-2ubuntu0.1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntu16.04	mbedtls	`2.2.1-2ubuntu0.2`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntu16.04	mbedtls	`2.2.1-2ubuntu0.3`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntupro	mbedtls	`2.16.2-1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntupro	mbedtls	`2.16.3-1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntupro	mbedtls	`2.16.4-1ubuntu2`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC
Ubuntupro	mbedtls	`2.16.4-1ubuntu2+esm1`	Affected	[UBUNTU-CVE-2020-36422]Apr 22, 2026, 12:41:40 PM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "mbedtls",
      "status": "fixed",
      "release": "sid",
      "version": "3.6.7-3"
    },
    {
      "name": "mbedtls",
      "status": "fixed",
      "release": "forky",
      "version": "3.6.7-3"
    },
    {
      "name": "mbedtls",
      "status": "fixed",
      "release": "trixie",
      "version": "3.6.6-0.1~deb13u1"
    },
    {
      "name": "mbedtls",
      "status": "fixed",
      "release": "bookworm",
      "version": "2.28.3-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "mbedtls",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.16.9-0.1"
    },
    {
      "bug": null,
      "name": "mbedtls",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.16.9-0.1"
    },
    {
      "bug": null,
      "name": "mbedtls",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "2.16.9-0.1"
    },
    {
      "bug": null,
      "name": "mbedtls",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "2.16.9-0.1"
    }
  ],
  "distribution_packages": [
    {
      "name": "mbedtls",
      "fixed_version": "2.16.9-0.1",
      "applicability_unknown": true
    },
    {
      "name": "mbedtls",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "2.1.2-1",
        "2.2.0-1",
        "2.2.1-1",
        "2.2.1-2",
        "2.2.1-2ubuntu0.1",
        "2.2.1-2ubuntu0.2",
        "2.2.1-2ubuntu0.3"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-36422",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-36422",
      "provider_updated_at": "2026-04-22T12:41:40.499024Z"
    },
    {
      "name": "mbedtls",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.16.2-1",
        "2.16.3-1",
        "2.16.4-1ubuntu2",
        "2.16.4-1ubuntu2+esm1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2020-36422",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2020-36422",
      "provider_updated_at": "2026-04-22T12:41:40.499024Z"
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libmbedcrypto7]Unknown
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
[libmbedtls14]Unknown
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
[libmbedtls-dev]Unknown
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
[libmbedtls-doc]Unknown
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · all · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- 2.28.3-1 · all · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
[libmbedx509-1]Unknown
Source package: [mbedtls]
Details (2)
- 2.28.3-1 · amd64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12
- 2.28.3-1 · arm64 · bookworm
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · bookworm; dsa · mbedtls · debian · 12

[Debian 13 (Trixie)]

[libmbedcrypto16]Unknown
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
[libmbedtls21]Unknown
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
[libmbedtls-dev]Unknown
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
[libmbedtls-doc]Unknown
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · all · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · all · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
[libmbedx509-7]Unknown
Source package: [mbedtls]
Details (2)
- 3.6.5-0.1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13
- 3.6.5-0.1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 2.16.9-0.1
  dsa · mbedtls · debian · 13

Observed: Oct 23, 2026, 5:51:51 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]