CVE-2020-36242

CRITICAL

cryptography < 3.3.2 - Integer Overflow and Buffer Overflow via Symmetric Encryption Update Calls

Title source: llm

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.

References (6)

Core 6

Core References

Exploit, Patch, Third Party Advisory x_refsource_misc

https://github.com/pyca/cryptography/issues/5615

Mailing List, Third Party Advisory vendor-advisory x_refsource_fedora

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/

Patch, Third Party Advisory x_refsource_misc

https://www.oracle.com/security-alerts/cpuapr2022.html

Patch, Third Party Advisory x_refsource_confirm

https://github.com/pyca/cryptography/compare/3.3.1...3.3.2

Release Notes, Third Party Advisory x_refsource_confirm

https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst

View Writeup ZIP pw:eip

Patch, Third Party Advisory x_refsource_misc

https://www.oracle.com/security-alerts/cpujul2022.html

Scores

CVSS v3 9.1

EPSS 0.0672

EPSS Percentile 93.1%

Attack Vector NETWORK

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

Details

CWE

CWE-190 CWE-787

Status published

Products (4)

cryptography.io/cryptography < 3.3.2

fedoraproject/fedora 33

oracle/communications_cloud_native_core_network_function_cloud_native_environment 1.10.0

pypi/cryptography 3.1 - 3.3.2PyPI

Published Feb 07, 2021

Tracked Since Feb 18, 2026