{"id":"USN-4478-2","summary":"python-rsa vulnerability","details":"USN-4478-1 fixed a vulnerability in Python-RSA.\nThis update provides the corresponding update for Ubuntu 16.04 ESM,\nUbuntu 18.04 ESM and Ubuntu 20.04 ESM.\n\nOriginal advisory details:\n\n It was discovered that Python-RSA incorrectly handled certain ciphertexts.\n An attacker could possibly use this issue to obtain sensitive information.\n","modified":"2026-02-10T04:41:54Z","published":"2022-02-21T17:25:41Z","related":["UBUNTU-CVE-2020-13757"],"upstream":["CVE-2020-13757","UBUNTU-CVE-2020-13757"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4478-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-13757"}],"affected":[{"package":{"name":"python-rsa","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/python-rsa@3.2.3-1.1ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.2.3-1.1ubuntu0.1~esm1"}]}],"versions":["3.1.4-1","3.2.3-1","3.2.3-1.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python-rsa","binary_version":"3.2.3-1.1ubuntu0.1~esm1"},{"binary_name":"python3-rsa","binary_version":"3.2.3-1.1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4478-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2020-13757","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"python-rsa","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/python-rsa@3.4.2-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.4.2-1ubuntu0.1~esm1"}]}],"versions":["3.4.2-1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python-rsa","binary_version":"3.4.2-1ubuntu0.1~esm1"},{"binary_name":"python3-rsa","binary_version":"3.4.2-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4478-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2020-13757","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}},{"package":{"name":"python-rsa","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/python-rsa@4.0-3ubuntu0.1~esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0-3ubuntu0.1~esm1"}]}],"versions":["4.0-2","4.0-3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"python3-rsa","binary_version":"4.0-3ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4478-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:20.04:LTS","cves":[{"id":"CVE-2020-13757","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}]}}}],"schema_version":"1.7.3"}