{
  "cveId": "CVE-2021-23017",
  "url": "https://patchblox.com/security/cve/CVE-2021-23017",
  "summary": "CVE-2021-23017 is fixed in 33 products on 1 platform, first by libnginx-mod-http-auth-pam 1.14.0-0ubuntu1.9, released May 24, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "nginx-mod-mail: nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, a...",
  "description": "nginx is a web and proxy server supporting HTTP and other protocols, with a focus on high concurrency, performance, and low memory usage. \n\nThe following packages have been upgraded to a later upstream version: nginx (1.20.1). (BZ#2031030)\n\nSecurity Fix(es):\n\n* nginx: Off-by-one in ngx_resolver_copy() when labels are followed by a pointer to a root domain name (CVE-2021-23017)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "published": "2021-05-24T17:00:00Z",
  "severity": "Important",
  "cvss": 9.4,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.53461,
  "epssPercentile": 0.98997,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libnginx-mod-http-auth-pam",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-auth-pam 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-auth-pam-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-auth-pam",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-auth-pam 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-auth-pam-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-cache-purge",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-cache-purge 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-cache-purge-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-cache-purge",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-cache-purge 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-cache-purge-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-dav-ext",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-dav-ext 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-dav-ext-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-dav-ext",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-dav-ext 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-dav-ext-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-echo",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-echo 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-echo-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-echo",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-echo 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-echo-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-fancyindex",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-fancyindex 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-fancyindex-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-fancyindex",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-fancyindex 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-fancyindex-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-geoip 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-geoip-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-geoip 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-geoip-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-geoip2",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-geoip2 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-geoip2-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-headers-more-filter",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-headers-more-filter 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-headers-more-filter-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-headers-more-filter",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-headers-more-filter 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-headers-more-filter-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-image-filter 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-image-filter-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-image-filter",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-image-filter 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-image-filter-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-lua",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-lua 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-lua-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-lua",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-lua 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-lua-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-ndk",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-ndk 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-ndk-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-ndk",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-ndk 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-ndk-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-perl",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-perl 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-perl-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-perl",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-perl 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-perl-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-subs-filter",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-subs-filter 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-subs-filter-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-subs-filter",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "fix": "libnginx-mod-http-subs-filter 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-subs-filter-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-uploadprogress",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-uploadprogress 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-uploadprogress-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-uploadprogress",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-http-uploadprogress 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-uploadprogress-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-upstream-fair",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-upstream-fair 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-upstream-fair-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-upstream-fair",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "fix": "libnginx-mod-http-upstream-fair 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-upstream-fair-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-xslt-filter",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-http-xslt-filter 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-http-xslt-filter-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-http-xslt-filter",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-http-xslt-filter-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-mail",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.14.0-0ubuntu1.9",
      "fix": "libnginx-mod-mail 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-mail-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-mail",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.18.0-0ubuntu1.2",
      "fix": "libnginx-mod-mail 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-mail-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-nchan",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-nchan-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-rtmp-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-rtmp",
      "release": "Ubuntu 20.04 LTS (focal)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-rtmp-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "libnginx-mod-stream",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "fix": "libnginx-mod-stream 1.14.0-0ubuntu1.9",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libnginx-mod-stream-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
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    {
      "platform": "linux",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libnginx-mod-stream-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
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    {
      "platform": "linux",
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      "release": "RHEL 8",
      "fixedVersion": "1:1.20.1-1.module\u002Bel8.5.0\u002B13723\u002Bab304644",
      "fix": "RHSA-2022:0323",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2022-0323",
      "released": "2022-01-31T00:00:00Z"
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      "release": "Ubuntu 18.04.6 LTS (bionic)",
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      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-nginx-1.14.0-0ubuntu1.9",
      "released": "2021-05-24T17:00:00Z"
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      "release": "Ubuntu 20.04 LTS (focal)",
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      "fix": "nginx 1.18.0-0ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-nginx-1.18.0-0ubuntu1.2",
      "released": "2021-05-24T17:00:00Z"
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    {
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      "fix": "ALSA-2022:0323",
      "url": "https://patchblox.com/security/fix/linux/alsa-2022-0323",
      "released": "2022-01-31T09:52:06Z"
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      "fix": "ELSA-2021-2259",
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