{"id":"CVE-2021-3657","details":"A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (\u003e=2GiB) IMAP literals, malicious or compromised IMAP servers, and hypothetically even external email senders, could cause several different buffer overflows, which could conceivably be exploited for remote code execution.","modified":"2026-03-15T22:41:08.191901Z","published":"2022-02-18T18:15:09.603Z","related":["openSUSE-SU-2024:11779-1"],"references":[{"type":"ADVISORY","url":"https://www.openwall.com/lists/oss-security/2021/12/03/1"},{"type":"ADVISORY","url":"https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html"},{"type":"ADVISORY","url":"https://security.gentoo.org/glsa/202208-15"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2028932"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-3657.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"1.4.4"}]},{"events":[{"introduced":"0"},{"last_affected":"35"}]},{"events":[{"introduced":"0"},{"last_affected":"7.0"}]},{"events":[{"introduced":"0"},{"last_affected":"9.0"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}