Security advisory

{
  "id": "7fdac22d0c21a39786f921c6f06dc21801cd4bc2b0f24ad01b1feae88acb6628",
  "url": "https://osv.dev/vulnerability/CVE-2020-24753",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-24753",
    "summary": "A memory corruption vulnerability in Objective Open CBOR Run-time (oocborrt) in versions before 2020-08-12 could allow an attacker to execute code via crafted Concise Binary Object Representation (CBOR) input to the cbor2json decoder. An uncaught error while decoding CBOR Major Type 3 text strings leads to the use of an attacker-controllable uninitialized stack value. This can be used to modify memory, causing a crash or potentially exploitable heap corruption.",
    "evidence": "osv:CVE-2020-24753",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2020-24753",
      "aliases": [
        "CVE-2020-24753"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/objsys/oocborrt",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "539851c66778f68a244633985f6f8d0df94ea3b3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "539851c66778f68a244633985f6f8d0df94ea3b3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-24753.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-24753-2f009dab",
                "digest": {
                  "length": 3014,
                  "function_hash": "15965622230956711754229119114543034177"
                },
                "source": "https://github.com/objsys/oocborrt/commit/539851c66778f68a244633985f6f8d0df94ea3b3",
                "target": {
                  "file": "util/cbor2json.c",
                  "function": "cbor2json"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-24753-404f680d",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "29850197593772512274951254950921194779",
                    "271994113519099298892212239242160950176",
                    "74768455046856666486715132268908730478",
                    "232839377084919003884958033439447754040"
                  ]
                },
                "source": "https://github.com/objsys/oocborrt/commit/539851c66778f68a244633985f6f8d0df94ea3b3",
                "target": {
                  "file": "util/cbor2json.c"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T13:56:59Z"
          }
        }
      ],
      "modified": "2026-10-20T13:56:59.011543087Z",
      "provider": "osv",
      "references": [
        "https://github.com/objsys/oocborrt/commit/539851c66778f68a244633985f6f8d0df94ea3b3",
        "https://warcollar.com/cve-2020-24753.html"
      ],
      "provider_metadata": {
        "unresolved_ranges": [
          {
            "cpes": [
              "cpe:2.3:a:objective_open_cbor_run-time_project:objective_open_cbor_run-time:*:*:*:*:*:*:*:*"
            ],
            "vendor_product": "objective_open_cbor_run-time_project:objective_open_cbor_run-time",
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2020-08-12"
                  }
                ],
                "source": "CPE_RANGE"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "2020-08-12"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ]
      }
    },
    "related_cves": [
      {
        "value": "CVE-2020-24753",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388444,
  "published_at": "2020-09-17T18:15:12.32+00:00"
}