CVE catalog

CVE-2021-2427

UBUNTU-

[CVE catalog]

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Optimizer). Supported versions that are affected are 8.0.25 and prior. Easily exploitable vulnerability allows high privileged attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. CVSS 3.1 Base Score 4.9 (Availability impacts). CVSS Vector: (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).

Severity
Medium · CVSS 4.9CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Published
Updated
Source
[NVD] · [CVE record]
EPSS
2.00% · Oct 27, 2026

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 / releasePackageVersionStatusSource
Ubuntu22.04mysql-8.08.0.26-0ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.17-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.17-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.18-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.18-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.18-0ubuntu5UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu5UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.20-0ubuntu0.20.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.21-0ubuntu0.20.04.3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]

Showing 12 observations. All 54 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Ubuntu14.04mysql-5.55.5.32-0ubuntu7UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.34-0ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.34-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.35+dfsg-1ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.35-0ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.37-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.38-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.40-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.41-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.43-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.44-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.46-0ubuntu0.14.04.2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.47-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.49-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.50-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.52-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.53-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.54-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.55-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.57-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.58-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.59-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.60-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.61-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu14.04mysql-5.55.5.62-0ubuntu0.14.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-server-5.65.6.22-rel71.0-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-server-5.65.6.22-rel71.0-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-server-5.65.6.22-rel71.0-0ubuntu4.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.21-25.8-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.21-25.8-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.21-25.8-0ubuntu3.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.21-25.8-0ubuntu3.2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.34-26.19-0ubuntu0.16.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.34-26.19-0ubuntu0.16.04.2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.37-26.21-0ubuntu0.16.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu16.04percona-xtradb-cluster-5.65.6.37-26.21-0ubuntu0.16.04.2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.17-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.17-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.18-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.18-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.18-0ubuntu5UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu4UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.19-0ubuntu5UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.20-0ubuntu0.20.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.21-0ubuntu0.20.04.3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.21-0ubuntu0.20.04.4UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.22-0ubuntu0.20.04.2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.22-0ubuntu0.20.04.3UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.23-0ubuntu0.20.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.25-0ubuntu0.20.04.1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu20.04mysql-8.08.0.26-0ubuntu0.20.04.2UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Ubuntu22.04mysql-8.08.0.26-0ubuntu1UnknownSource applicability is not established[UBUNTU-CVE-2021-2427]
Original provider fields
{
  "package_releases": [],
  "fixed_versions": [],
  "distribution_packages": [
    {
      "name": "mysql-5.5",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "14.04",
      "versions": [
        "5.5.32-0ubuntu7",
        "5.5.34-0ubuntu1",
        "5.5.34-0ubuntu2",
        "5.5.35-0ubuntu1",
        "5.5.35+dfsg-1ubuntu1",
        "5.5.37-0ubuntu0.14.04.1",
        "5.5.38-0ubuntu0.14.04.1",
        "5.5.40-0ubuntu0.14.04.1",
        "5.5.41-0ubuntu0.14.04.1",
        "5.5.43-0ubuntu0.14.04.1",
        "5.5.44-0ubuntu0.14.04.1",
        "5.5.46-0ubuntu0.14.04.2",
        "5.5.47-0ubuntu0.14.04.1",
        "5.5.49-0ubuntu0.14.04.1",
        "5.5.50-0ubuntu0.14.04.1",
        "5.5.52-0ubuntu0.14.04.1",
        "5.5.53-0ubuntu0.14.04.1",
        "5.5.54-0ubuntu0.14.04.1",
        "5.5.55-0ubuntu0.14.04.1",
        "5.5.57-0ubuntu0.14.04.1",
        "5.5.58-0ubuntu0.14.04.1",
        "5.5.59-0ubuntu0.14.04.1",
        "5.5.60-0ubuntu0.14.04.1",
        "5.5.61-0ubuntu0.14.04.1",
        "5.5.62-0ubuntu0.14.04.1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-2427",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-2427",
      "provider_updated_at": "2026-04-22T12:49:35.510542Z",
      "applicability_unknown": true
    },
    {
      "name": "percona-server-5.6",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "5.6.22-rel71.0-0ubuntu2",
        "5.6.22-rel71.0-0ubuntu4",
        "5.6.22-rel71.0-0ubuntu4.1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-2427",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-2427",
      "provider_updated_at": "2026-04-22T12:49:35.510542Z",
      "applicability_unknown": true
    },
    {
      "name": "percona-xtradb-cluster-5.6",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "5.6.21-25.8-0ubuntu2",
        "5.6.21-25.8-0ubuntu3",
        "5.6.21-25.8-0ubuntu3.1",
        "5.6.21-25.8-0ubuntu3.2",
        "5.6.34-26.19-0ubuntu0.16.04.1",
        "5.6.34-26.19-0ubuntu0.16.04.2",
        "5.6.37-26.21-0ubuntu0.16.04.1",
        "5.6.37-26.21-0ubuntu0.16.04.2"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-2427",
      "fixed_version": "",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-2427",
      "provider_updated_at": "2026-04-22T12:49:35.510542Z",
      "applicability_unknown": true
    },
    {
      "name": "mysql-8.0",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.0.26-0ubuntu0.20.04.2"
            }
          ]
        }
      ],
      "release": "20.04",
      "versions": [
        "8.0.17-0ubuntu2",
        "8.0.17-0ubuntu3",
        "8.0.18-0ubuntu3",
        "8.0.18-0ubuntu4",
        "8.0.18-0ubuntu5",
        "8.0.19-0ubuntu2",
        "8.0.19-0ubuntu3",
        "8.0.19-0ubuntu4",
        "8.0.19-0ubuntu5",
        "8.0.20-0ubuntu0.20.04.1",
        "8.0.21-0ubuntu0.20.04.3",
        "8.0.21-0ubuntu0.20.04.4",
        "8.0.22-0ubuntu0.20.04.2",
        "8.0.22-0ubuntu0.20.04.3",
        "8.0.23-0ubuntu0.20.04.1",
        "8.0.25-0ubuntu0.20.04.1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-2427",
      "fixed_version": "8.0.26-0ubuntu0.20.04.2",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-2427",
      "provider_updated_at": "2026-04-22T12:49:35.510542Z",
      "applicability_unknown": true
    },
    {
      "name": "mysql-8.0",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "8.0.26-0ubuntu1"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-2427",
      "fixed_version": "8.0.26-0ubuntu1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-2427",
      "provider_updated_at": "2026-04-22T12:49:35.510542Z",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

Observed:

References

[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]