Security advisory

{
  "id": "72ac85d8cfc3924f6c5a5f1d7fab4eadc88591857a062a6affc3c805aa638f91",
  "url": "https://osv.dev/vulnerability/CVE-2021-3429",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-3429",
    "summary": "When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.",
    "evidence": "osv:CVE-2021-3429",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-3429",
      "aliases": [
        "CVE-2021-3429"
      ],
      "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"
                },
                {
                  "fixed": "13877549527812959f59e4add685bc42d350edd8"
                },
                {
                  "fixed": "b794d426b9ab43ea9d6371477466070d86e10668"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:canonical:cloud-init:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "21.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "b794d426b9ab43ea9d6371477466070d86e10668"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "19.1",
            "21.1",
            "20.4",
            "20.3",
            "20.2",
            "20.1",
            "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-2021-3429.json"
          }
        }
      ],
      "modified": "2026-10-20T10:53:48.654266763Z",
      "provider": "osv",
      "references": [
        "https://github.com/canonical/cloud-init/commit/b794d426b9ab43ea9d6371477466070d86e10668"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-3429",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 384656,
  "published_at": "2023-04-19T22:15:10.137+00:00"
}