{
  "cveId": "CVE-2021-33912",
  "url": "https://patchblox.com/security/cve/CVE-2021-33912",
  "summary": "CVE-2021-33912 is fixed in 4 products on 1 platform, first by libmail-spf-xs-perl 1.2.10-7ubuntu0.18.04.1~esm1, released January 19, 2022. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "libspf2: libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to execute arbitra...",
  "description": "libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF DNS record, because of incorrect sprintf usage in SPF_record_expand_data in spf_expand.c. The vulnerable code may be part of the supply chain of a site\u0027s e-mail infrastructure (e.g., with additional configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2 with Postfix; older versions of spfquery relied on libspf2) but most often is not.",
  "published": "2022-01-19T10:15:00Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.09643,
  "epssPercentile": 0.95521,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libmail-spf-xs-perl",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.2.10-7ubuntu0.18.04.1~esm1",
      "fix": "libmail-spf-xs-perl 1.2.10-7ubuntu0.18.04.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libmail-spf-xs-perl-1.2.10-7ubuntu0.18.04.1-esm1",
      "released": "2022-01-19T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libmail-spf-xs-perl",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.2.10-7\u002Bdeb9u2build0.20.04.1",
      "fix": "libmail-spf-xs-perl 1.2.10-7\u002Bdeb9u2build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libmail-spf-xs-perl-1.2.10-7-deb9u2build0.20.04.1",
      "released": "2022-01-19T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libspf2",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.2.10-7.1",
      "fix": "DEBIAN-CVE-2021-33912",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-33912",
      "released": "2022-01-19T18:15:07Z"
    },
    {
      "platform": "linux",
      "product": "libspf2",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.2.10-7.1",
      "fix": "DEBIAN-CVE-2021-33912",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-33912",
      "released": "2022-01-19T18:15:07Z"
    },
    {
      "platform": "linux",
      "product": "libspf2",
      "release": "Debian 14",
      "fixedVersion": "1.2.10-7.1",
      "fix": "DEBIAN-CVE-2021-33912",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-33912",
      "released": "2022-01-19T18:15:07Z"
    },
    {
      "platform": "linux",
      "product": "libspf2-2",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.2.10-7ubuntu0.18.04.1~esm1",
      "fix": "libspf2-2 1.2.10-7ubuntu0.18.04.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libspf2-2-1.2.10-7ubuntu0.18.04.1-esm1",
      "released": "2022-01-19T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libspf2-2",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.2.10-7\u002Bdeb9u2build0.20.04.1",
      "fix": "libspf2-2 1.2.10-7\u002Bdeb9u2build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libspf2-2-1.2.10-7-deb9u2build0.20.04.1",
      "released": "2022-01-19T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "spfquery",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.2.10-7ubuntu0.18.04.1~esm1",
      "fix": "spfquery 1.2.10-7ubuntu0.18.04.1~esm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-spfquery-1.2.10-7ubuntu0.18.04.1-esm1",
      "released": "2022-01-19T10:15:00Z"
    },
    {
      "platform": "linux",
      "product": "spfquery",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.2.10-7\u002Bdeb9u2build0.20.04.1",
      "fix": "spfquery 1.2.10-7\u002Bdeb9u2build0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-spfquery-1.2.10-7-deb9u2build0.20.04.1",
      "released": "2022-01-19T10:15:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}