CVE-2020-36242
CRITICAL EPSS 93.1%
Published Feb 7, 20215y ago · Modified Jun 17, 20262w ago
9.1 CVSS 3.1
Published Feb 7, 2021 5y ago
Last Modified Jun 17, 2026 2w ago
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 Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity None
Availability High
Threat Intelligence
EPSS Exploit Probability
93.1% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available
Weaknesses 2
CWE-190 Integer Overflow or Wraparound Numeric Error
CWE-787 Out-of-bounds Write Memory Safety
Affected Products 3
| Vendor | Product | Version | Range |
|---|---|---|---|
| cryptography.io | cryptography | * | <3.3.2 |
| fedoraproject | fedora | 33 | any |
| oracle | communications_cloud_native_core_network_function_cloud_native_environment | 1.10.0 | any |
References 6
- github.com https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
- github.com https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
- github.com https://github.com/pyca/cryptography/issues/5615
- lists.fedoraproject.org https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
- oracle.com https://www.oracle.com/security-alerts/cpuapr2022.html
- oracle.com https://www.oracle.com/security-alerts/cpujul2022.html
Remediation
- github.com https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
- github.com https://github.com/pyca/cryptography/issues/5615
- oracle.com https://www.oracle.com/security-alerts/cpuapr2022.html
- oracle.com https://www.oracle.com/security-alerts/cpujul2022.html