{"id":"UBUNTU-CVE-2020-12872","details":"yaws_config.erl in Yaws through 2.0.2 and/or 2.0.7 loads obsolete TLS ciphers, as demonstrated by ones that allow Sweet32 attacks, if running on an Erlang/OTP virtual machine with a version less than 21.0.","modified":"2026-05-20T16:04:09.343863802Z","published":"2020-05-15T19:15:00Z","upstream":["CVE-2020-12872"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-12872"},{"type":"REPORT","url":"https://medium.com/@charlielabs101/cve-2020-12872-df315411aa70"},{"type":"REPORT","url":"https://github.com/erlyaws/yaws/blob/c0fd79f17d52628fcec527da7fa3e788c283c445/src/yaws_config.erl#L2068-L2075"},{"type":"REPORT","url":"https://github.com/erlyaws/yaws/releases"},{"type":"REPORT","url":"https://sweet32.info/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-12872"}],"affected":[{"package":{"name":"yaws","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/yaws?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.98-5","1.99-1","1.99-2","2.0.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"erlang-yapp","binary_version":"2.0.2-1"},{"binary_version":"2.0.2-1","binary_name":"erlang-yaws"},{"binary_name":"yaws","binary_version":"2.0.2-1"},{"binary_name":"yaws-chat","binary_version":"2.0.2-1"},{"binary_name":"yaws-mail","binary_version":"2.0.2-1"},{"binary_name":"yaws-wiki","binary_version":"2.0.2-1"},{"binary_name":"yaws-yapp","binary_version":"2.0.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12872.json"}},{"package":{"name":"yaws","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/yaws?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.4+dfsg-2","2.0.4+dfsg-2ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"erlang-yapp","binary_version":"2.0.4+dfsg-2ubuntu0.1"},{"binary_name":"erlang-yaws","binary_version":"2.0.4+dfsg-2ubuntu0.1"},{"binary_version":"2.0.4+dfsg-2ubuntu0.1","binary_name":"yaws"},{"binary_name":"yaws-chat","binary_version":"2.0.4+dfsg-2ubuntu0.1"},{"binary_version":"2.0.4+dfsg-2ubuntu0.1","binary_name":"yaws-mail"},{"binary_name":"yaws-wiki","binary_version":"2.0.4+dfsg-2ubuntu0.1"},{"binary_name":"yaws-yapp","binary_version":"2.0.4+dfsg-2ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12872.json"}},{"package":{"name":"yaws","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/yaws?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.6+dfsg-1","2.0.6+dfsg-3","2.0.7+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_version":"2.0.7+dfsg-1","binary_name":"erlang-yapp"},{"binary_name":"erlang-yaws","binary_version":"2.0.7+dfsg-1"},{"binary_name":"yaws","binary_version":"2.0.7+dfsg-1"},{"binary_version":"2.0.7+dfsg-1","binary_name":"yaws-chat"},{"binary_name":"yaws-mail","binary_version":"2.0.7+dfsg-1"},{"binary_name":"yaws-wiki","binary_version":"2.0.7+dfsg-1"},{"binary_version":"2.0.7+dfsg-1","binary_name":"yaws-yapp"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12872.json"}},{"package":{"name":"yaws","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/yaws?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.0.8+dfsg-3","2.0.9+dfsg-1","2.1.0+dfsg-1","2.1.1+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"erlang-yapp","binary_version":"2.1.1+dfsg-1"},{"binary_version":"2.1.1+dfsg-1","binary_name":"erlang-yaws"},{"binary_name":"yaws","binary_version":"2.1.1+dfsg-1"},{"binary_name":"yaws-chat","binary_version":"2.1.1+dfsg-1"},{"binary_version":"2.1.1+dfsg-1","binary_name":"yaws-mail"},{"binary_version":"2.1.1+dfsg-1","binary_name":"yaws-wiki"},{"binary_name":"yaws-yapp","binary_version":"2.1.1+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12872.json"}},{"package":{"name":"yaws","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/yaws?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.1+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"erlang-yapp","binary_version":"2.1.1+dfsg-2"},{"binary_name":"erlang-yaws","binary_version":"2.1.1+dfsg-2"},{"binary_version":"2.1.1+dfsg-2","binary_name":"yaws"},{"binary_name":"yaws-chat","binary_version":"2.1.1+dfsg-2"},{"binary_name":"yaws-mail","binary_version":"2.1.1+dfsg-2"},{"binary_version":"2.1.1+dfsg-2","binary_name":"yaws-wiki"},{"binary_name":"yaws-yapp","binary_version":"2.1.1+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-12872.json"}},{"package":{"name":"yaws","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/yaws?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.2.0+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_name":"er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