{"id":"UBUNTU-CVE-2019-18222","details":"The ECDSA signature implementation in ecdsa.c in Arm Mbed Crypto 2.1 and Mbed TLS through 2.19.1 does not reduce the blinded scalar before computing the inverse, which allows a local attacker to recover the private key via side-channel attacks.","modified":"2026-04-22T12:13:44.331091Z","published":"2020-01-23T17:15:00Z","upstream":["CVE-2019-18222"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-18222"},{"type":"REPORT","url":"https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-12"},{"type":"REPORT","url":"https://tls.mbed.org/tech-updates/security-advisories"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-18222"}],"affected":[{"package":{"name":"mbedtls","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/mbedtls@2.2.1-2ubuntu0.3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2-1","2.2.0-1","2.2.1-1","2.2.1-2","2.2.1-2ubuntu0.1","2.2.1-2ubuntu0.2","2.2.1-2ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.1-2ubuntu0.3","binary_name":"libmbedcrypto0"},{"binary_version":"2.2.1-2ubuntu0.3","binary_name":"libmbedtls10"},{"binary_version":"2.2.1-2ubuntu0.3","binary_name":"libmbedx509-0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-18222.json"}},{"package":{"name":"mbedtls","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/mbedtls@2.8.0-1ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.1-1ubuntu1","2.6.0-1","2.7.0-2","2.8.0-1","2.8.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.8.0-1ubuntu0.1~esm1","binary_name":"libmbedcrypto1"},{"binary_version":"2.8.0-1ubuntu0.1~esm1","binary_name":"libmbedtls10"},{"binary_version":"2.8.0-1ubuntu0.1~esm1","binary_name":"libmbedx509-0"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2019/UBUNTU-CVE-2019-18222.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"medium"}]}