{"id":"CVE-2021-32559","url":"https://www.cyber-defence.io/tools/cve/CVE-2021-32559","generatedAt":"2026-10-27T21:20:23.744Z","title":"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.","description":"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.","published":"2021-07-06T12:15:22.000Z","lastModified":"2026-06-17T03:53:11.000Z","status":"Analyzed","sourceIdentifier":"cve@mitre.org","cvss":{"version":"3.1","score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-190"],"affected":["mhammond/pywin32"],"epss":{"score":0.01729,"percentile":0.7742,"date":"2026-10-26","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (1.73%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.md","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/mhammond/pywin32/issues/1700","tags":["Patch","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/mhammond/pywin32/pull/1701","tags":["Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/mhammond/pywin32/releases","tags":["Release Notes","Third Party Advisory"],"source":"cve@mitre.org"},{"url":"https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.md","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mhammond/pywin32/issues/1700","tags":["Patch","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mhammond/pywin32/pull/1701","tags":["Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://github.com/mhammond/pywin32/releases","tags":["Release Notes","Third Party Advisory"],"source":"af854a3a-2127-422b-91ae-364da2661108"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2021-32559","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}