CVE-2021-3657

—

CVSS 3.1

9.8 critical

EPSS

3%p88

Published

Feb 18, 2022 (Feb 18, 2022)

Modified

Jun 17, 2026

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.

Vendors: isync project fedoraproject redhat debian
Products: isync, fedora, enterprise linux, debian linux
Weakness: CWE-119
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (3.5%)

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