Integer overflow in Mhammond Pywin32
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.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/mhammond/pywin32/releases (Third Party Advisory, Release Notes)
- github.com/fireeye/Vulnerability-Disclosures/blob/master/FEYE-2021-0017/FEYE-20… (Third Party Advisory)
- github.com/mhammond/pywin32/issues/1700 (Patch, Third Party Advisory)
- github.com/mhammond/pywin32/pull/1701 (Third Party Advisory)
Frequently asked questions
- What is CVE-2021-32559?
- CVE-2021-32559 is a medium-severity vulnerability in Mhammond Pywin32, classified under Integer Overflow or Wraparound. CVSS score: 6.5/10. Published 2021-07-06.
- How severe is CVE-2021-32559?
- Medium severity. CVSS v3 base score is 6.5 out of 10.