{"cve":"CVE-2020-25659","nvd":{"published":"2021-01-11T16:15:15.040","modified":"2026-06-17T03:07:04.600","status":"Modified","description":"python-cryptography 3.2 is vulnerable to Bleichenbacher timing attacks in the RSA decryption API, via timed processing of valid PKCS#1 v1.5 ciphertext.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","score":5.9},"cwes":["CWE-385"],"references":["https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b","https://www.oracle.com/security-alerts/cpuapr2022.html","https://www.oracle.com/security-alerts/cpujul2022.html","https://github.com/pyca/cryptography/pull/5507/commits/ce1bef6f1ee06ac497ca0c837fbd1c7ef6c2472b","https://www.oracle.com/security-alerts/cpuapr2022.html"],"products":["cryptography.io:cryptography","oracle:communications_cloud_native_core_network_function_cloud_native_environment"],"source":"nvd","synced_at":"2026-10-19T21:12:09.559580076+00:00"},"epss":{"cve":"CVE-2020-25659","score":0.02463,"percentile":0.84469,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-hggm-jpg3-v476","url":"https://osv.dev/vulnerability/GHSA-hggm-jpg3-v476","summary":"RSA decryption vulnerable to Bleichenbacher timing vulnerability","modified":"2024-11-24T05:24:23.229640Z","packages":[{"ecosystem":"PyPI","name":"cryptography","purl":"pkg:pypi/cryptography","ranges":["<3.2"],"fixed":["3.2"]}]},{"id":"PYSEC-2021-62","url":"https://osv.dev/vulnerability/PYSEC-2021-62","summary":"","modified":"2023-11-08T04:03:11.264590Z","packages":[{"ecosystem":"PyPI","name":"cryptography","purl":"pkg:pypi/cryptography","ranges":["<3.2.1"],"fixed":["3.2.1"]}]}],"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."]}