Security advisory

{
  "id": "26b90337b7a55e56fd9314d391f634bdad905354cd0b36c2fc556ecdbb199a1a",
  "url": "https://osv.dev/vulnerability/CVE-2021-4021",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-4021",
    "summary": "A vulnerability was found in Radare2 in versions prior to 5.6.2, 5.6.0, 5.5.4 and 5.5.2. Mapping a huge section filled with zeros of an ELF64 binary for MIPS architecture can lead to uncontrolled resource consumption and DoS.",
    "evidence": "osv:CVE-2021-4021",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-4021",
      "aliases": [
        "CVE-2021-4021"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/radareorg/radare2",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "last_affected": "ab6353c5c9e5578a8080c071d01e28f8b7e06d0e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:radare:radare2:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "last_affected": "5.5.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "5.5.0",
            "5.4.2",
            "5.4.0",
            "5.4.0-git",
            "5.3.1",
            "5.3.0",
            "5.2.1",
            "5.2.0",
            "5.1.1",
            "5.1.0",
            "release-5.0.0",
            "5.0.0",
            "4.5.1",
            "4.4.0",
            "4.3.1",
            "Continuous-Windows",
            "4.3.0",
            "continuous",
            "4.2.1",
            "4.2.0",
            "4.1.1",
            "4.1.0",
            "4.0.0",
            "3.9.0",
            "3.8.0",
            "3.7.1",
            "3.7.0",
            "3.6.0",
            "3.5.1",
            "3.5.0",
            "3.4.1",
            "3.4.0",
            "3.3.0",
            "3.2.1",
            "3.2.0",
            "3.1.3",
            "3.1.2",
            "3.1.1",
            "3.1.0",
            "3.0.1",
            "3.0.0",
            "2.9.0",
            "2.8.0",
            "2.7.0",
            "2.6.9",
            "2.6.0",
            "2.5.0",
            "2.4.0",
            "2.2.0",
            "2.1.0",
            "2.0.1",
            "2.0.0",
            "1.6.0",
            "1.5.0",
            "1.4.0",
            "1.3.0",
            "1.3.0-git",
            "1.2.0",
            "1.2.0-git",
            "1.1.0",
            "1.0.2",
            "1.0.1",
            "1.0.0",
            "1.0",
            "0.10.6",
            "0.10.5",
            "0.10.4-termux4",
            "termux",
            "0.10.4",
            "0.10.3",
            "0.10.2",
            "0.10.1",
            "0.10.0",
            "radare2-windows-nightly",
            "0.9.9",
            "0.9.8",
            "0.9.8-rc4",
            "0.9.8-rc3",
            "0.9.8-rc2",
            "0.9.8-rc1",
            "0.9.7",
            "0.9.6",
            "0.9.4",
            "0.9.2",
            "0.9",
            "0.8.8",
            "0.8.6"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-4021.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:55.769182902Z",
      "provider": "osv",
      "references": [
        "https://github.com/radareorg/radare2/issues/19436"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-4021",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 386473,
  "published_at": "2022-02-24T19:15:09.533+00:00"
}