CVE-2021-32559

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.

• CWE-190

• https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.mdThird Party Advisory
• https://github.com/mhammond/pywin32/issues/1700Patch, Third Party Advisory
• https://github.com/mhammond/pywin32/pull/1701Third Party Advisory
• https://github.com/mhammond/pywin32/releasesRelease Notes, Third Party Advisory
• https://github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.mdThird Party Advisory
• https://github.com/mhammond/pywin32/issues/1700Patch, Third Party Advisory
• https://github.com/mhammond/pywin32/pull/1701Third Party Advisory
• https://github.com/mhammond/pywin32/releasesRelease Notes, Third Party Advisory

Published

Jul 6, 2021

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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