Security advisory

{
  "id": "022bda021ec5638e365545cfe11be9390d43d6e3184136f758938b4be24f9152",
  "url": "https://osv.dev/vulnerability/CVE-2021-20264",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-20264",
    "summary": "An insecure modification flaw in the /etc/passwd file was found in the openjdk-1.8 and openjdk-11 containers. This flaw allows an attacker with access to the container to modify the /etc/passwd and escalate their privileges. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.",
    "evidence": "osv:CVE-2021-20264",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-20264",
      "aliases": [
        "CVE-2021-20264"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openjdk/jdk",
              "type": "GIT",
              "events": [
                {
                  "introduced": "da75f3c4ad5bdf25167a3ed80e51f567ab3dbd01"
                },
                {
                  "last_affected": "da75f3c4ad5bdf25167a3ed80e51f567ab3dbd01"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:oracle:openjdk:11:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "11"
                      },
                      {
                        "last_affected": "11"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "11",
            "jdk-11-ga",
            "jdk-11+28"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20264.json"
          }
        },
        {
          "ranges": [
            {
              "repo": "https://github.com/openjdk/jdk15u",
              "type": "GIT",
              "events": [
                {
                  "introduced": "a9a271179d2a7952154b7509a999b100cc98b13c"
                },
                {
                  "last_affected": "a9a271179d2a7952154b7509a999b100cc98b13c"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:oracle:openjdk:11:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "11"
                      },
                      {
                        "last_affected": "11"
                      }
                    ],
                    "source": "CPE_STRING"
                  }
                ]
              }
            }
          ],
          "versions": [
            "11",
            "jdk-11+0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-20264.json"
          }
        }
      ],
      "modified": "2026-10-24T10:31:06.246282176Z",
      "provider": "osv",
      "references": [
        "https://bugzilla.redhat.com/show_bug.cgi?id=1932283"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:oracle:openjdk:1.8.0:*:*:*:*:*:*:*",
              "cpe:2.3:a:oracle:openjdk:11:*:*:*:*:*:*:*"
            ],
            "vendor_product": "oracle:openjdk",
            "extracted_events": [
              {
                "range": [
                  {
                    "introduced": "1.8.0"
                  },
                  {
                    "last_affected": "1.8.0"
                  },
                  {
                    "introduced": "1.8.0"
                  },
                  {
                    "last_affected": "1.8.0"
                  },
                  {
                    "introduced": "1.8.0"
                  },
                  {
                    "last_affected": "1.8.0"
                  },
                  {
                    "introduced": "11"
                  },
                  {
                    "last_affected": "11"
                  }
                ],
                "source": "CPE_STRING"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2021-20264",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 440946,
  "published_at": "2021-10-06T16:15:07.297+00:00"
}