{"id":"UBUNTU-CVE-2025-27809","details":"Mbed TLS before 2.28.10 and 3.x before 3.6.3, on the client side, accepts servers that have trusted certificates for arbitrary hostnames unless the TLS client application calls mbedtls_ssl_set_hostname.","modified":"2026-04-22T15:40:45.602252Z","published":"2025-03-25T06:15:00Z","upstream":["CVE-2025-27809"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-27809"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-27809"},{"type":"REPORT","url":"https://mbed-tls.readthedocs.io/en/latest/security-advisories/mbedtls-security-advisory-2025-03-1/"}],"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_name":"libmbedx509-0","binary_version":"2.2.1-2ubuntu0.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27809.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_name":"libmbedtls10","binary_version":"2.8.0-1ubuntu0.1~esm1"},{"binary_name":"libmbedx509-0","binary_version":"2.8.0-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27809.json"}},{"package":{"name":"mbedtls","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/mbedtls@2.16.4-1ubuntu2+esm1?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.2-1","2.16.3-1","2.16.4-1ubuntu2","2.16.4-1ubuntu2+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libmbedcrypto3","binary_version":"2.16.4-1ubuntu2+esm1"},{"binary_name":"libmbedtls12","binary_version":"2.16.4-1ubuntu2+esm1"},{"binary_name":"libmbedx509-0","binary_version":"2.16.4-1ubuntu2+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27809.json"}},{"package":{"name":"mbedtls","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/mbedtls@2.28.0-1build1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.16.9-0.1ubuntu1","2.16.11-0.1ubuntu1","2.16.11-0.3","2.28.0-1","2.28.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libmbedcrypto7","binary_version":"2.28.0-1build1"},{"binary_name":"libmbedtls14","binary_version":"2.28.0-1build1"},{"binary_name":"libmbedx509-1","binary_version":"2.28.0-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27809.json"}},{"package":{"name":"mbedtls","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/mbedtls@2.28.8-1?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.28.3-1","2.28.6-1ubuntu1","2.28.7-1ubuntu1","2.28.7-1.1ubuntu1","2.28.8-1"],"ecosystem_specific":{"binaries":[{"binary_name":"libmbedcrypto7t64","binary_version":"2.28.8-1"},{"binary_name":"libmbedtls14t64","binary_version":"2.28.8-1"},{"binary_name":"libmbedx509-1t64","binary_version":"2.28.8-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27809.json"}},{"package":{"name":"mbedtls","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/mbedtls@3.6.2-3ubuntu1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.6.2-3ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"libmbedcrypto16","binary_version":"3.6.2-3ubuntu1"},{"binary_name":"libmbedtls21","binary_version":"3.6.2-3ubuntu1"},{"binary_name":"libmbedx509-7","binary_version":"3.6.2-3ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-27809.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N"},{"type":"Ubuntu","score":"medium"}]}