Critical severity9.8NVD Advisory· Published Feb 18, 2022· Updated Jun 17, 2026

CVE-2021-3657

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

mbsync/mbsyncdescription
Mbsync/mbsyncllm-create
Range: <1.4.4
osv-coords
pkg:rpm/opensuse/isync&distro=openSUSE%20Tumbleweed
Range: < 1.4.4-1.1

Patches

Vulnerability mechanics

References

bugzilla.redhat.com/show_bug.cginvdIssue TrackingThird Party Advisory
lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlnvdMailing ListThird Party Advisory
security.gentoo.org/glsa/202208-15nvdThird Party Advisory
www.openwall.com/lists/oss-security/2021/12/03/1nvdMailing ListThird Party Advisory

News mentions

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cvss	0.637
epss	0.003
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000