{
  "cveId": "CVE-2021-3156",
  "url": "https://patchblox.com/security/cve/CVE-2021-3156",
  "summary": "CVE-2021-3156 is fixed in 2 products on 1 platform, first by RHSA-2021:0218, released January 26, 2021. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on April 6, 2022. Patch Radar priority: Patch now.",
  "title": "sudo: The sudo packages contain the sudo utility which allows system administrators to provide certain users with the permi...",
  "description": "The sudo packages contain the sudo utility which allows system administrators to provide certain users with the permission to execute privileged commands, which are used for system management purposes, without having to log in as root.\n\nSecurity Fix(es):\n\n* sudo: Heap buffer overflow in argument parsing (CVE-2021-3156)\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": "2021-01-26T00:00:00Z",
  "severity": "Important",
  "cvss": 7.8,
  "epss": 0.99962,
  "epssPercentile": 0.99975,
  "priority": "Patch now",
  "priorityTier": 1,
  "exploited": true,
  "vendorExploited": false,
  "disclosed": false,
  "kev": {
    "added": "2022-04-06T00:00:00Z",
    "due": "2022-04-27T00:00:00Z",
    "ransomware": false,
    "requiredAction": "Apply updates per vendor instructions."
  },
  "fixes": [
    {
      "platform": "linux",
      "product": "sudo",
      "release": "RHEL 8",
      "fixedVersion": "0:1.8.29-6.el8_3.1",
      "fix": "RHSA-2021:0218",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-0218",
      "released": "2021-01-26T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sudo",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.8.21p2-3ubuntu1.4",
      "fix": "sudo 1.8.21p2-3ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-sudo-1.8.21p2-3ubuntu1.4",
      "released": "2021-01-26T10:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sudo",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.8.31-1ubuntu1.2",
      "fix": "sudo 1.8.31-1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-sudo-1.8.31-1ubuntu1.2",
      "released": "2021-01-26T10:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sudo",
      "release": "ol 8",
      "fixedVersion": "0:1.8.29-6.el8_3.1",
      "fix": "ELSA-2021-0218",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-0218",
      "released": "2021-01-27T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sudo-ldap",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "1.8.21p2-3ubuntu1.4",
      "fix": "sudo-ldap 1.8.21p2-3ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-sudo-ldap-1.8.21p2-3ubuntu1.4",
      "released": "2021-01-26T10:00:00Z"
    },
    {
      "platform": "linux",
      "product": "sudo-ldap",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.8.31-1ubuntu1.2",
      "fix": "sudo-ldap 1.8.31-1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-sudo-ldap-1.8.31-1ubuntu1.2",
      "released": "2021-01-26T10:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}