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Vulnerability record · CVE-2020-36242 · published 7 February 2021

CVE-2020-36242: Cryptography.io cryptography integer overflow vulnerability

CCryptography.Io · Cryptography

In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.

9.1 CVSS 3.1 Critical EPSS 6.7% · top 6.3% CWE-190 · Integer overflowCWE-787 · Out-of-bounds write
9.1CVSS 3.1 base score, v2 6.4
6.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
3Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

Description

In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.

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

Affected products

3 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release NotesThird Party Advisory
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 PatchThird Party Advisory
https://github.com/pyca/cryptography/issues/5615 ExploitPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6B
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release NotesThird Party Advisory
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 PatchThird Party Advisory
https://github.com/pyca/cryptography/issues/5615 ExploitPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6B
https://www.oracle.com/security-alerts/cpuapr2022.html PatchThird Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-36242), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.