{"cve":"CVE-2020-13757","nvd":{"published":"2020-06-01T19:15:10.067","modified":"2026-06-17T02:53:36.237","status":"Modified","description":"Python-RSA before 4.1 ignores leading '\\0' bytes during decryption of ciphertext. This could conceivably have a security-relevant impact, e.g., by helping an attacker to infer that an application uses Python-RSA, or if the length of accepted ciphertext affects application behavior (such as by causing excessive memory allocation).","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:N","score":7.5},"cwes":["CWE-327"],"references":["https://github.com/sybrenstuvel/python-rsa/issues/146","https://github.com/sybrenstuvel/python-rsa/issues/146#issuecomment-641845667","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2KILTHBHNSDUCYV22ODLOKTICJJ7JQIQ/","https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZYB65VNILRBTXL6EITQTH2PZPK7I23MW/","https://usn.ubuntu.com/4478-1/"],"products":["canonical:ubuntu_linux","fedoraproject:fedora","python-rsa_project:python-rsa"],"source":"nvd","synced_at":"2026-10-19T21:05:42.039641217+00:00"},"epss":{"cve":"CVE-2020-13757","score":0.01432,"percentile":0.73065,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-537h-rv9q-vvph","url":"https://osv.dev/vulnerability/GHSA-537h-rv9q-vvph","summary":"Python-RSA decryption of ciphertext leads to DoS","modified":"2024-10-21T22:00:53.647822Z","packages":[{"ecosystem":"PyPI","name":"rsa","purl":"pkg:pypi/rsa","ranges":["<4.1"],"fixed":["4.1"]}]},{"id":"PYSEC-2020-99","url":"https://osv.dev/vulnerability/PYSEC-2020-99","summary":"","modified":"2023-11-08T04:02:21.687509Z","packages":[{"ecosystem":"PyPI","name":"rsa","purl":"pkg:pypi/rsa","ranges":["<4.1"],"fixed":["4.1"]}]}],"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."]}