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Vulnerabilities / CVE-2021-3657

critical

CVE-2021-3657

A flaw was found in mbsync versions prior to 1.4.4. Due to inadequate ...

Published Modified CWE 119
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD. Rated lower by Ubuntu (medium).

Description

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.

Affected packages and fixed versions

SourcePackageFixed in
alpine 3.15isync1.4.4-r0
alpine 3.16isync1.4.4-r0
alpine 3.17isync1.4.4-r0
alpine 3.18isync1.4.4-r0
alpine 3.19isync1.4.4-r0
alpine 3.20isync1.4.4-r0
alpine 3.21isync1.4.4-r0
alpine 3.22isync1.4.4-r0
alpine 3.23isync1.4.4-r0
alpine 3.24isync1.4.4-r0
alpine edgeisync1.4.4-r0
debian 10isync1.3.0-2.2~deb10u2
Show all 27 entries from 27 sources
SourcePackageFixed in
alpine 3.15isync1.4.4-r0
alpine 3.16isync1.4.4-r0
alpine 3.17isync1.4.4-r0
alpine 3.18isync1.4.4-r0
alpine 3.19isync1.4.4-r0
alpine 3.20isync1.4.4-r0
alpine 3.21isync1.4.4-r0
alpine 3.22isync1.4.4-r0
alpine 3.23isync1.4.4-r0
alpine 3.24isync1.4.4-r0
alpine edgeisync1.4.4-r0
debian 10isync1.3.0-2.2~deb10u2
debian 11isync1.3.0-2.2+deb11u1
debian 12isync1.4.4-1
debian 13isync1.4.4-1
debian 14isync1.4.4-1
debian 9isync1.2.1-2+deb9u1
echoisync1.4.4-1
rapidfort ubuntu 20.04isyncno fix listed
rapidfort ubuntu 22.04isyncno fix listed
rapidfort ubuntu 24.04isyncno fix listed
ubuntu 18.04-ESMisyncno fix listed
ubuntu 20.04-ESMisyncno fix listed
ubuntu 22.04isyncno fix listed
ubuntu 24.04isyncno fix listed
ubuntu 26.04isyncno fix listed
ubuntu 26.10isyncno fix listed

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.