Security advisory

{
  "id": "3e18edacf976a665aca991a452aea50e768b909e4d89081d06bfbbc816890f9d",
  "url": "https://osv.dev/vulnerability/CVE-2021-22552",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-22552",
    "summary": "An untrusted memory read vulnerability in Asylo versions up to 0.6.1 allows an untrusted attacker to pass a syscall number in MessageReader that is then used by sysno() and can bypass validation. This can allow the attacker to read memory from within the secure enclave. We recommend updating to Asylo 0.6.3 or past https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a",
    "evidence": "osv:CVE-2021-22552",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-22552",
      "aliases": [
        "CVE-2021-22552"
      ],
      "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/google/asylo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "17169aad236c61f5290528b6c05cc714463d02f4"
                },
                {
                  "fixed": "90d7619e9dd99bcdb6cd28c7649d741d254d9a1a"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:google:asylo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "0.6.1"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "90d7619e9dd99bcdb6cd28c7649d741d254d9a1a"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.6.1",
            "buildenv-v0.6.1",
            "v0.6.0",
            "buildenv-v0.6.0",
            "v0.5.3",
            "buildenv-v0.5.3",
            "v0.5.2",
            "buildenv-v0.5.2",
            "v0.5.1",
            "buildenv-v0.5.1",
            "v0.5.0",
            "buildenv-v0.5.0",
            "v0.4.1",
            "buildenv-v0.4.1",
            "v0.4.0",
            "buildenv-v0.4.0",
            "v0.3.4.1",
            "v0.3.4",
            "buildenv-v0.3.4",
            "v0.3.3",
            "buildenv-v0.3.3",
            "v0.3.2",
            "buildenv-v0.3.2",
            "v0.3.1",
            "buildenv-v0.3.1",
            "v0.3.0",
            "buildenv-v0.3.0",
            "v0.2.2",
            "buildenv-v0.2.2",
            "v0.2.1",
            "buildenv-v0.2.1",
            "v0.2.0",
            "buildenv-v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-22552.json",
            "vanir_signatures": [
              {
                "id": "CVE-2021-22552-9a21f5ce",
                "digest": {
                  "length": 2217,
                  "function_hash": "135803722592334962389266461099265418365"
                },
                "source": "https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a",
                "target": {
                  "file": "asylo/platform/system_call/system_call.cc",
                  "function": "enc_untrusted_syscall"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2021-22552-9c773ff8",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "188814768948624246284165097045374109059",
                    "318325663397942036138718595093274855716",
                    "117362229874402543323080661403110076872",
                    "105653472901708474773495083639344234908"
                  ]
                },
                "source": "https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a",
                "target": {
                  "file": "asylo/platform/system_call/system_call.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:23:27Z"
          }
        }
      ],
      "modified": "2026-10-20T14:23:27.705802693Z",
      "provider": "osv",
      "references": [
        "https://github.com/google/asylo/commit/90d7619e9dd99bcdb6cd28c7649d741d254d9a1a"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-22552",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388868,
  "published_at": "2021-08-02T16:15:07.817+00:00"
}