{"id":"UBUNTU-CVE-2021-44143","details":"A flaw was found in mbsync in isync 1.4.0 through 1.4.3. Due to an unchecked condition, a malicious or compromised IMAP server could use a crafted mail message that lacks headers (i.e., one that starts with an empty line) to provoke a heap overflow, which could conceivably be exploited for remote code execution.","modified":"2026-01-20T17:20:11.381912Z","published":"2021-11-22T20:15:00Z","upstream":["CVE-2021-44143"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-44143"},{"type":"REPORT","url":"https://sourceforge.net/p/isync/isync/commit_browser"},{"type":"REPORT","url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999804"},{"type":"REPORT","url":"https://sourceforge.net/p/isync/isync/ref/master/tags/"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-44143"}],"affected":[{"package":{"name":"isync","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/isync@1.1.2-1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.2-1"],"ecosystem_specific":{"binaries":[{"binary_name":"isync","binary_version":"1.1.2-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44143.json"}},{"package":{"name":"isync","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/isync@1.4.4-3ubuntu0.22.04.1?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.0-2.2","1.4.3-1","1.4.4-1","1.4.4-3","1.4.4-3ubuntu0.22.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"isync","binary_version":"1.4.4-3ubuntu0.22.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44143.json"}},{"package":{"name":"isync","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/isync@1.4.4-5build3?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.4-5","1.4.4-5build2","1.4.4-5build3"],"ecosystem_specific":{"binaries":[{"binary_name":"isync","binary_version":"1.4.4-5build3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44143.json"}},{"package":{"name":"isync","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/isync@1.5.1-1ubuntu1?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.4.4-5build3","1.5.1-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"isync","binary_version":"1.5.1-1ubuntu1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-44143.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}