{"cve":"CVE-2020-36242","nvd":{"published":"2021-02-07T20:15:12.090","modified":"2026-06-17T03:15:11.793","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H","score":9.1},"cwes":["CWE-190","CWE-787"],"references":["https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst","https://github.com/pyca/cryptography/compare/3.3.1...3.3.2","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"],"products":["cryptography.io:cryptography","fedoraproject:fedora","oracle:communications_cloud_native_core_network_function_cloud_native_environment"],"source":"nvd","synced_at":"2026-10-19T21:14:10.479542811+00:00"},"epss":{"cve":"CVE-2020-36242","score":0.06718,"percentile":0.93931,"date":"2026-11-01"},"kev":null,"osv":[{"id":"GHSA-rhm9-p9w5-fwm7","url":"https://osv.dev/vulnerability/GHSA-rhm9-p9w5-fwm7","summary":"PyCA Cryptography symmetrically encrypting large values can lead to integer overflow","modified":"2025-02-15T05:29:30.639484Z","packages":[{"ecosystem":"PyPI","name":"cryptography","purl":"pkg:pypi/cryptography","ranges":[">=3.1 <3.3.2"],"fixed":["3.3.2"]}]},{"id":"PYSEC-2021-63","url":"https://osv.dev/vulnerability/PYSEC-2021-63","summary":"","modified":"2023-11-08T04:03:42.949464Z","packages":[{"ecosystem":"PyPI","name":"cryptography","purl":"pkg:pypi/cryptography","ranges":[">=3.1 <3.3.2"],"fixed":["3.3.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}