Security advisory

{
  "id": "a3cb3d8a7bed6c66ff5173d169d2a003519d2461ccb7667132eb357525491e5f",
  "url": "https://osv.dev/vulnerability/CVE-2020-8631",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8631",
    "summary": "cloud-init through 19.4 relies on Mersenne Twister for a random password, which makes it easier for attackers to predict passwords, because rand_str in cloudinit/util.py calls the random.choice function.",
    "evidence": "osv:CVE-2020-8631",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8631",
      "aliases": [
        "CVE-2020-8631"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/canonical/cloud-init",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "a1063b89e32fa698382bb9617632c0b5f206cdb4"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:canonical:cloud-init:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "19.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "19.1",
            "19.4",
            "19.3",
            "19.2",
            "18.5",
            "18.4",
            "18.3",
            "18.2",
            "18.1",
            "17.2",
            "17.1",
            "0.7.9",
            "0.7.5",
            "0.7.8",
            "0.6.3",
            "0.6.2",
            "0.7.7",
            "0.7.6",
            "0.7.4",
            "0.7.3",
            "0.7.2",
            "0.7.1",
            "0.7.0",
            "0.6.1",
            "0.6.0",
            "0.5.16pre1",
            "0.5.15",
            "0.5.14",
            "0.5.13",
            "0.5.12",
            "0.5.11",
            "0.5.10",
            "0.5.8",
            "0.5.6",
            "0.5.5",
            "0.5.4",
            "0.5.3",
            "0.5.2",
            "0.5.1",
            "0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8631.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:25.647056159Z",
      "provider": "osv",
      "references": [
        "https://lists.debian.org/debian-lts-announce/2020/02/msg00021.html",
        "https://bugs.launchpad.net/ubuntu/+source/cloud-init/+bug/1860795",
        "https://github.com/canonical/cloud-init/pull/204"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*"
            ],
            "vendor_product": "debian:debian_linux",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "8.0"
                  },
                  {
                    "last_affected": "8.0"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          },
          {
            "cpes": [
              "cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:*"
            ],
            "vendor_product": "opensuse:leap",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "15.1"
                  },
                  {
                    "last_affected": "15.1"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-8631",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385348,
  "published_at": "2020-02-05T14:15:11.607+00:00"
}