Security advisory

{
  "id": "c1ccaee432bcdf59e56c0b559e72b8594aabac79b04cf1a776e2e13a2fd41f77",
  "url": "https://osv.dev/vulnerability/CVE-2021-29221",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-29221",
    "summary": "A local privilege escalation vulnerability was discovered in Erlang/OTP prior to version 23.2.3. By adding files to an existing installation's directory, a local attacker could hijack accounts of other users running Erlang programs or possibly coerce a service running with \"erlsrv.exe\" to execute arbitrary code as Local System. This can occur only under specific conditions on Windows with unsafe filesystem permissions.",
    "evidence": "osv:CVE-2021-29221",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2021-29221",
      "aliases": [
        "CVE-2021-29221"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/erlang/otp",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "050a78f8a67ed76a632f0e73b76ceb83e7054e5f"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:erlang:erlang\\/otp:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "23.2.3"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "050a78f8a67ed76a632f0e73b76ceb83e7054e5f"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "OTP-23.2.3"
                  }
                ]
              }
            }
          ],
          "versions": [
            "OTP-23.0",
            "OTP-21.0",
            "OTP-23.2",
            "OTP-22.0",
            "OTP-23.2.2",
            "OTP-23.2.1",
            "OTP-23.1",
            "OTP-23.0-rc3",
            "OTP-23.0-rc2",
            "OTP-23.0-rc1",
            "OTP-20.0",
            "OTP-22.0-rc3",
            "OTP-22.0-rc2",
            "OTP-22.0-rc1",
            "OTP-19.0",
            "OTP-21.0-rc2",
            "OTP-18.0",
            "OTP-21.0-rc1",
            "OTP-17.0",
            "OTP-20.0-rc2",
            "OTP-20.0-rc1",
            "OTP-19.0-rc2",
            "OTP-19.0-rc1",
            "OTP_R16B",
            "OTP-18.0-rc1",
            "OTP_17.0-rc2",
            "OTP_17.0-rc1",
            "OTP_R13B03",
            "OTP_R16A_RELEASE_CANDIDATE",
            "OTP_R14B03",
            "OTP_R15B",
            "OTP_R15A",
            "OTP_R14B02",
            "OTP_R14B01",
            "OTP_R14B",
            "OTP_R13B04",
            "OTP_R14A"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-29221.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:36.917074967Z",
      "provider": "osv",
      "references": [
        "https://github.com/erlang/otp/releases/tag/OTP-23.2.3",
        "https://deepsurface.com/deepsurface-security-advisory-local-privilege-escalation-in-erlang-on-windows-cve-2021-29221/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-29221",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385736,
  "published_at": "2021-04-09T14:15:12.91+00:00"
}