vuln-ubuntu/data/osv/usn/USN-5232-1.json

{
  "schema_version": "1.7.0",
  "id": "USN-5232-1",
  "summary": "fail2ban vulnerability",
  "details": "Jakub \u017boczek discovered that certain Fail2ban actions handled whois responses in\nan insecure way. If Fail2ban was configured to use certain mail actions\nlike 'mail-whois' on a target system, a remote attacker who was able to control whois\nresponses to this target system could possibly execute arbitrary code.\n",
  "aliases": [],
  "upstream": [
    "UBUNTU-CVE-2021-32749"
  ],
  "related": [],
  "published": "2022-09-12T07:45:30Z",
  "modified": "2026-06-29T10:52:53Z",
  "affected": [
    {
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "fail2ban",
        "purl": "pkg:deb/ubuntu/fail2ban@0.8.11-1ubuntu0.1~esm1?arch=source&distro=trusty/esm"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.8.11-1ubuntu0.1~esm1"
            }
          ]
        }
      ],
      "versions": [
        "0.8.10-3",
        "0.8.11~pre1+git29-gccd2657-1",
        "0.8.11-1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fail2ban",
            "binary_version": "0.8.11-1ubuntu0.1~esm1"
          }
        ],
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:Pro:14.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-32749",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "fail2ban",
        "purl": "pkg:deb/ubuntu/fail2ban@0.9.3-1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.9.3-1ubuntu0.1~esm1"
            }
          ]
        }
      ],
      "versions": [
        "0.9.3-1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fail2ban",
            "binary_version": "0.9.3-1ubuntu0.1~esm1"
          }
        ],
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:Pro:16.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-32749",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "fail2ban",
        "purl": "pkg:deb/ubuntu/fail2ban@0.10.2-2ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.10.2-2ubuntu0.1~esm1"
            }
          ]
        }
      ],
      "versions": [
        "0.9.7-2",
        "0.10.2-1",
        "0.10.2-2"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fail2ban",
            "binary_version": "0.10.2-2ubuntu0.1~esm1"
          }
        ],
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:Pro:18.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-32749",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    },
    {
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "fail2ban",
        "purl": "pkg:deb/ubuntu/fail2ban@0.11.1-1ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"
      },
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.11.1-1ubuntu0.1~esm1"
            }
          ]
        }
      ],
      "versions": [
        "0.10.2-2.1",
        "0.11.1-1"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "fail2ban",
            "binary_version": "0.11.1-1ubuntu0.1~esm1"
          }
        ],
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
      },
      "database_specific": {
        "cves_map": {
          "ecosystem": "Ubuntu:Pro:20.04:LTS",
          "cves": [
            {
              "id": "CVE-2021-32749",
              "severity": [
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:N/I:H/A:N"
                },
                {
                  "type": "CVSS_V3",
                  "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                  "type": "Ubuntu",
                  "score": "medium"
                }
              ]
            }
          ]
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5232-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-32749"
    }
  ]
}