Security advisory

{
  "id": "a23304bf318c4d8475d2a15518af2e2f8712e54b50c4467bef24f409933649d1",
  "url": "https://osv.dev/vulnerability/CVE-2021-44421",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-44421",
    "summary": "The pointer-validation logic in util/mem_util.rs in Occlum before 0.26.0 for Intel SGX acts as a confused deputy that allows a local attacker to access unauthorized information via side-channel analysis.",
    "evidence": "osv:CVE-2021-44421",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-44421",
      "aliases": [
        "CVE-2021-44421"
      ],
      "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/occlum/occlum",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "a428ea3409bab6d605042552594c41d716d02ab8"
                },
                {
                  "fixed": "36918e42bf6732c4d3996bc99eb013eb6b90b249"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:occlum_project:occlum:*:*:*:*:*:software_guard_extensions:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.26.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "36918e42bf6732c4d3996bc99eb013eb6b90b249"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.25.0",
            "0.24.2",
            "0.24.1",
            "0.24.0",
            "0.23.7",
            "0.23.6",
            "0.23.5",
            "0.23.4",
            "0.23.3",
            "0.23.2",
            "0.23.1",
            "0.23.0",
            "0.22.0",
            "0.21.0",
            "0.20.0",
            "0.18.1",
            "0.17.0",
            "0.16.0",
            "0.15.1",
            "0.15.0",
            "0.14.0",
            "0.13.1",
            "0.13.0",
            "0.12.2",
            "0.12.1",
            "0.12.0",
            "0.11.0",
            "0.10.0",
            "0.9.0",
            "0.8.0",
            "0.7.0",
            "0.6.0",
            "0.5.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-44421.json"
          }
        }
      ],
      "modified": "2026-10-20T10:55:06.110621838Z",
      "provider": "osv",
      "references": [
        "https://github.com/occlum/occlum/compare/0.25.0...v0.26.0",
        "https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249",
        "https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130",
        "https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-44421",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386890,
  "published_at": "2022-03-10T17:44:15.447+00:00"
}