{
  "cveId": "CVE-2021-3997",
  "url": "https://patchblox.com/security/cve/CVE-2021-3997",
  "summary": "CVE-2021-3997 is fixed in 37 products on 1 platform, first by libnss-myhostname 245.4-4ubuntu3.15, released January 9, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "systemd: A flaw was found in systemd",
  "description": "A flaw was found in systemd. An uncontrolled recursion in systemd-tmpfiles may lead to a denial of service at boot time when too many nested directories are created in /tmp.",
  "published": "2022-01-09T16:00:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.01735,
  "epssPercentile": 0.77812,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libnss-myhostname",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libnss-myhostname 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnss-myhostname-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnss-mymachines",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libnss-mymachines 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnss-mymachines-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnss-resolve",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libnss-resolve 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnss-resolve-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnss-systemd",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libnss-systemd 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnss-systemd-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libpam-systemd",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libpam-systemd 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libpam-systemd-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libsystemd0",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libsystemd0 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libsystemd0-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libudev1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "libudev1 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libudev1-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "250.2-1",
      "fix": "DEBIAN-CVE-2021-3997",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3997",
      "released": "2022-08-23T20:15:08Z"
    },
    {
      "platform": "linux",
      "product": "systemd",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "250.2-1",
      "fix": "DEBIAN-CVE-2021-3997",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3997",
      "released": "2022-08-23T20:15:08Z"
    },
    {
      "platform": "linux",
      "product": "systemd",
      "release": "Debian 14",
      "fixedVersion": "250.2-1",
      "fix": "DEBIAN-CVE-2021-3997",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3997",
      "released": "2022-08-23T20:15:08Z"
    },
    {
      "platform": "linux",
      "product": "systemd",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-container",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd-container 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-container-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-container",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-container-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-coredump",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd-coredump 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-coredump-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-devel",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-journal-remote",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd-journal-remote 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-journal-remote-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-journal-remote",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "systemd-journal-remote-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "systemd-libs",
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      "fix": "ALAS2023-2023-025",
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      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
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      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "systemd-networkd",
      "release": "amzn 2023",
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      "released": "2023-02-17T20:43:00Z"
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      "product": "systemd-networkd-debuginfo",
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      "fix": "ALAS2023-2023-025",
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      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "systemd-oomd-defaults",
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      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
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      "released": "2023-02-17T20:43:00Z"
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      "product": "systemd-pam",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2023-025",
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      "fix": "ALAS2023-2023-025",
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      "fix": "ALAS2023-2023-025",
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      "released": "2023-02-17T20:43:00Z"
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      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
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    {
      "platform": "linux",
      "product": "systemd-standalone-tmpfiles",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-standalone-tmpfiles-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-sysv",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd-sysv 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-sysv-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-tests",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd-tests 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-tests-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-tests",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-tests-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-timesyncd",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "systemd-timesyncd 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-systemd-timesyncd-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-udev",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "systemd-udev-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "252.4-1161.amzn2023.0.1",
      "fix": "ALAS2023-2023-025",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-025",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "udev",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "245.4-4ubuntu3.15",
      "fix": "udev 245.4-4ubuntu3.15",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-udev-245.4-4ubuntu3.15",
      "released": "2022-01-09T16:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}