Cyber Resilience

CVE-2021-32559

Medium

Published: 06 July 2021

Published
06 July 2021
Modified
27 March 2025
KEV Added
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Patch
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CVSS Score v3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS Score 0.0019 40.9th percentile
Risk Priority 13 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-32559 is a medium-severity Integer Overflow or Wraparound (CWE-190) vulnerability in Mhammond Pywin32. Its CVSS base score is 6.5 (Medium).

Operationally, ranked at the 40.9th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

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…

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vulnerability could crash the vulnerable process.

CWE(s)
CWE-190

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

mhammond
pywin32
≤ 301

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References