ubuntu-cve-2021-20225
Vulnerability from osv_ubuntu
Published
2021-03-02 18:00
Modified
2025-09-08 16:46
Summary
Details

A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Severity
6.7 (Medium)
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "grub-efi-amd64-signed",
            "binary_version": "1.34.24+2.02~beta2-9ubuntu1.21"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "grub2-signed",
        "purl": "pkg:deb/ubuntu/grub2-signed@1.34.24?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.22",
        "1.23",
        "1.24",
        "1.25",
        "1.26",
        "1.27",
        "1.30",
        "1.31",
        "1.32",
        "1.33",
        "1.34",
        "1.34.1",
        "1.34.2",
        "1.34.3",
        "1.34.4",
        "1.34.5",
        "1.34.6",
        "1.34.7",
        "1.34.8",
        "1.34.9",
        "1.34.13",
        "1.34.14",
        "1.34.16",
        "1.34.17",
        "1.34.18",
        "1.34.20",
        "1.34.22",
        "1.34.24"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "grub-efi-amd64-signed",
            "binary_version": "1.167~18.04.5+2.04-1ubuntu44.1.2"
          },
          {
            "binary_name": "grub-efi-arm64-signed",
            "binary_version": "1.167~18.04.5+2.04-1ubuntu44.1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "grub2-signed",
        "purl": "pkg:deb/ubuntu/grub2-signed@1.167~18.04.5?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.167~18.04.5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.85",
        "1.86",
        "1.87",
        "1.89",
        "1.91",
        "1.92",
        "1.93",
        "1.93.1",
        "1.93.2",
        "1.93.3",
        "1.93.4",
        "1.93.5",
        "1.93.7",
        "1.93.8",
        "1.93.10",
        "1.93.11",
        "1.93.13",
        "1.93.14",
        "1.93.15",
        "1.93.16",
        "1.93.18",
        "1.93.19",
        "1.93.20",
        "1.93.21",
        "1.93.22",
        "1.93.24",
        "1.167~18.04.1",
        "1.167~18.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "grub-efi-amd64",
            "binary_version": "2.04-1ubuntu44.1.2"
          },
          {
            "binary_name": "grub-efi-amd64-bin",
            "binary_version": "2.04-1ubuntu44.1.2"
          },
          {
            "binary_name": "grub-efi-arm64",
            "binary_version": "2.04-1ubuntu44.1.2"
          },
          {
            "binary_name": "grub-efi-arm64-bin",
            "binary_version": "2.04-1ubuntu44.1.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "grub2-unsigned",
        "purl": "pkg:deb/ubuntu/grub2-unsigned@2.04-1ubuntu44.1.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-1ubuntu44.1.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.04-1ubuntu44",
        "2.04-1ubuntu44.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "grub-efi-amd64-signed",
            "binary_version": "1.167.2+2.04-1ubuntu44.2"
          },
          {
            "binary_name": "grub-efi-arm64-signed",
            "binary_version": "1.167.2+2.04-1ubuntu44.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "grub2-signed",
        "purl": "pkg:deb/ubuntu/grub2-signed@1.167.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.167.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.128",
        "1.129",
        "1.130",
        "1.131",
        "1.133",
        "1.134",
        "1.135",
        "1.136",
        "1.137",
        "1.138",
        "1.139",
        "1.140",
        "1.141",
        "1.142",
        "1.142.1",
        "1.142.3",
        "1.142.4",
        "1.142.5",
        "1.142.6",
        "1.142.8",
        "1.142.9",
        "1.142.10",
        "1.142.11",
        "1.167"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "grub-efi-amd64",
            "binary_version": "2.04-1ubuntu44.2"
          },
          {
            "binary_name": "grub-efi-amd64-bin",
            "binary_version": "2.04-1ubuntu44.2"
          },
          {
            "binary_name": "grub-efi-arm64",
            "binary_version": "2.04-1ubuntu44.2"
          },
          {
            "binary_name": "grub-efi-arm64-bin",
            "binary_version": "2.04-1ubuntu44.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "grub2-unsigned",
        "purl": "pkg:deb/ubuntu/grub2-unsigned@2.04-1ubuntu44.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.04-1ubuntu44.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.04-1ubuntu44"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in grub2 in versions prior to 2.06. The option parser allows an attacker to write past the end of a heap-allocated buffer by calling certain commands with a large number of specific short forms of options. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
  "id": "UBUNTU-CVE-2021-20225",
  "modified": "2025-09-08T16:46:55Z",
  "published": "2021-03-02T18:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-20225"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4992-1"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-20225"
    }
  ],
  "related": [
    "USN-4992-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-20225"
  ]
}



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