{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": "cpe:2.3:a:occlum_project:occlum:*:*:*:*:*:software_guard_extensions:*:*",
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.26.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "a428ea3409bab6d605042552594c41d716d02ab8"
            },
            {
              "fixed": "36918e42bf6732c4d3996bc99eb013eb6b90b249"
            }
          ],
          "repo": "https://github.com/occlum/occlum",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {},
  "details": "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.",
  "id": "CVE-2021-44421",
  "modified": "2026-07-08T05:37:58.857919272Z",
  "published": "2022-03-10T17:44:15.447Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/occlum/occlum/compare/0.25.0...v0.26.0"
    },
    {
      "type": "FIX",
      "url": "https://github.com/occlum/occlum/commit/36918e42bf6732c4d3996bc99eb013eb6b90b249"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L130"
    },
    {
      "type": "EVIDENCE",
      "url": "https://github.com/occlum/occlum/blob/821ea843ae21037e6cff5268306d2da1fb131552/src/libos/src/util/mem_util.rs#L51"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}