Security advisory

{
  "id": "54dcc8756b83dbda3469495c058e626d78e7d829eebf588ade969f72816f7d5f",
  "url": "https://osv.dev/vulnerability/CVE-2021-32559",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2021-32559",
    "summary": "An integer overflow exists in pywin32 prior to version b301 when adding an access control entry (ACE) to an access control list (ACL) that would cause the size to be greater than 65535 bytes. An attacker who successfully exploited this vulnerability could crash the vulnerable process.",
    "evidence": "osv:CVE-2021-32559",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2021-32559",
      "aliases": [
        "CVE-2021-32559",
        "GHSA-hwfp-hg2m-9vr2",
        "PYSEC-2021-112"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/mhammond/pywin32",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ee666896defbe2ded8ef68b65db3bd9c0d5c057e"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:mhammond:pywin32:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "301"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "b300",
            "b228",
            "b227",
            "b226",
            "b225",
            "b224",
            "b223",
            "b222",
            "b221",
            "b220",
            "b219",
            "218.5",
            "b218",
            "b217",
            "cvs2hg",
            "b216",
            "b215",
            "b214",
            "b213",
            "py3k-merge-complete",
            "b212",
            "b211",
            "b209",
            "b208",
            "b207",
            "b206",
            "b205",
            "b204",
            "b203",
            "b201",
            "b200",
            "b153",
            "b141",
            "ActivePython210",
            "b139",
            "b135",
            "ActivePython202",
            "b134",
            "b132",
            "b131",
            "b130",
            "b127",
            "b126"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-32559.json"
          }
        }
      ],
      "modified": "2026-10-20T10:54:42.548001034Z",
      "provider": "osv",
      "references": [
        "https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.md",
        "https://github.com/mhammond/pywin32/pull/1701",
        "https://github.com/mhammond/pywin32/releases",
        "https://github.com/mhammond/pywin32/issues/1700"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2021-32559",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 385950,
  "published_at": "2021-07-06T12:15:21.887+00:00"
}