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  5. CVE-2021-32559

CVE-2021-32559: Integer overflow in pywin32

August 9, 2021 (updated March 27, 2025)

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.

References

  • github.com/advisories/GHSA-hwfp-hg2m-9vr2
  • github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-2021-0017.md
  • github.com/mhammond/pywin32
  • github.com/mhammond/pywin32/issues/1700
  • github.com/mhammond/pywin32/pull/1701
  • github.com/mhammond/pywin32/releases
  • github.com/pypa/advisory-database/tree/main/vulns/pywin32/PYSEC-2021-112.yaml
  • nvd.nist.gov/vuln/detail/CVE-2021-32559

Code Behaviors & Features

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Affected versions

All versions before 301

Fixed versions

  • 301

Solution

Upgrade to version 301 or above.

Impact 6.5 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Learn more about CVSS

Weakness

  • CWE-190: Integer Overflow or Wraparound

Source file

pypi/pywin32/CVE-2021-32559.yml

Spotted a mistake? Edit the file on GitLab.

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