CVE-2020-36242
CRITICAL 9.1
At a glance
- Source
- NVD
- EPSS
- EPSS 6.72 % · percentile 94 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- mitre
- NVD status
- Modified
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.
Weaknesses (CWE)
References
- https://github.com/pyca/cryptography/issues/5615
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
- https://www.oracle.com/security-alerts/cpuapr2022.html
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
- https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
- https://www.oracle.com/security-alerts/cpujul2022.html
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H | NVD · nvd@nist.gov (Primary) |
| CVSS 2.0 | MEDIUM 6.4 | AV:N/AC:L/Au:N/C:P/I:N/A:P | NVD · nvd@nist.gov (Primary) |
Advisories
- GHSA-rhm9-p9w5-fwm7 — PyCA Cryptography symmetrically encrypting large values can lead to integer overflow
- PYSEC-2021-63 — 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 overf
European references
- ENISA EUVD · EUVD-2021-0048
- GCVE · GCVE-0-2020-36242
CERT-FR advisories
- CERTFR-2026-AVI-0627 — Multiples vulnérabilités dans les produits Splunk · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0309 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2025-AVI-0135 — Multiples vulnérabilités dans IBM QRadar Deployment Intelligence App · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0958 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0297 — Multiples vulnérabilités dans Juniper · cert.ssi.gouv.fr
- CERTFR-2024-AVI-0262 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
- CERTFR-2023-AVI-0034 — Multiples vulnérabilités dans les produits Oracle · cert.ssi.gouv.fr
- CERTFR-2021-AVI-505 — Multiples vulnérabilités dans IBM Spectrum · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:*< 3.3.2cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| affected n/a |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |