Security advisory

{
  "id": "cacb38ab3fe0749aaa8fddc4fa396ecfa62c595f5cfe81d109016f419df7e0fd",
  "url": "https://osv.dev/vulnerability/CVE-2021-27099",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-27099",
    "summary": "In SPIRE before versions 0.8.5, 0.9.4, 0.10.2, 0.11.3 and 0.12.1, the \"aws_iid\" Node Attestor improperly normalizes the path provided through the agent ID templating feature, which may allow the issuance of an arbitrary SPIFFE ID within the same trust domain, if the attacker controls the value of an EC2 tag prior to attestation, and the attestor is configured for agent ID templating where the tag value is the last element in the path. This issue has been fixed in SPIRE versions 0.11.3 and 0.12.1",
    "evidence": "osv:CVE-2021-27099",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-27099",
      "aliases": [
        "CVE-2021-27099",
        "GHSA-q7gm-mjrg-44h9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/spiffe/spire",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "cbedaa14ed36628a6f936b38d35544662c8176f2"
                },
                {
                  "introduced": "f2a8727b2404fbf95a283bd543ef4de49f648047"
                },
                {
                  "fixed": "bcc218e5d5432fffcda3593aee97df69db0f4c87"
                },
                {
                  "introduced": "429286051c1e0d729be2bec8d7ee26204494cf7a"
                },
                {
                  "fixed": "5adc2d93869fa3bcc6f0dc45a727c4e6db384eb5"
                },
                {
                  "introduced": "2e266b84a0486128efc4ca7179ce3ef943c0baad"
                },
                {
                  "fixed": "a1762b93059a7408f85cf3c1d5a23bee45fd0d4f"
                },
                {
                  "introduced": "ead65eef8c186f55a3366a814ca1e1c2ae52e73c"
                },
                {
                  "fixed": "3c5115b57afc20a0a2c2b1b9dd60dd1fd9082e13"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:cncf:spire:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.8.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:cncf:spire:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.9.0"
                      },
                      {
                        "fixed": "0.9.4"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:cncf:spire:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.10.0"
                      },
                      {
                        "fixed": "0.10.2"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:cncf:spire:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.11.0"
                      },
                      {
                        "fixed": "0.11.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "cpe": "cpe:2.3:a:cncf:spire:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0.12.0"
                      },
                      {
                        "fixed": "0.12.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.12.0",
            "proto/spire/v0.12.0",
            "v0.11.2",
            "proto/spire/v0.11.2",
            "v0.9.3",
            "proto/spire/v0.9.3",
            "v0.10.1",
            "proto/spire/v0.10.1",
            "0.8.4",
            "v0.11.1",
            "proto/spire/v0.11.1",
            "v0.11.0",
            "proto/spire/v0.11.0",
            "v0.10.0",
            "proto/spire/v0.10.0",
            "v0.9.2",
            "proto/spire/v0.9.2",
            "0.9.1",
            "0.9.0",
            "0.8.3",
            "0.8.2",
            "0.8.1",
            "0.8.0",
            "0.7.0",
            "0.6.0",
            "0.5.1",
            "0.5",
            "0.4",
            "0.3",
            "0.2",
            "0.0.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-27099.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:37.963160667Z",
      "provider": "osv",
      "references": [
        "https://github.com/spiffe/spire/security/advisories/GHSA-q7gm-mjrg-44h9"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-27099",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385782,
  "published_at": "2021-03-05T18:15:13.067+00:00"
}