Medium severity6.5NVD Advisory· Published Jul 6, 2021· Updated Jun 17, 2026
CVE-2021-32559
CVE-2021-32559
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pywin32PyPI | < 301 | 301 |
Affected products
3- pywin32/pywin32description
Patches
Vulnerability mechanics
References
7- github.com/mhammond/pywin32/issues/1700nvdPatchThird Party AdvisoryWEB
- github.com/advisories/GHSA-hwfp-hg2m-9vr2ghsaADVISORY
- github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.mdnvdThird Party AdvisoryWEB
- github.com/mhammond/pywin32/pull/1701nvdThird Party AdvisoryWEB
- github.com/mhammond/pywin32/releasesnvdRelease NotesThird Party AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2021-32559ghsaADVISORY
- github.com/pypa/advisory-database/tree/main/vulns/pywin32/PYSEC-2021-112.yamlghsaWEB
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