isync: A flaw was found in mbsync versions prior to 1.4.4
CVE-2021-3657 is fixed in isync on 1 platform, first by DEBIAN-CVE-2021-3657, released February 18, 2022. It is not reported as exploited. Patch Radar priority: Urgent.
A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate handling of extremely large (>=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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| isync · Debian 12.15 (bookworm) | 1.4.4-1 | DEBIAN-CVE-2021-3657 | Feb 18, 2022 |
| isync · Debian 13.5 (trixie) | 1.4.4-1 | DEBIAN-CVE-2021-3657 | Feb 18, 2022 |
| isync · Debian 14 | 1.4.4-1 | DEBIAN-CVE-2021-3657 | Feb 18, 2022 |
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