CVE-2021-3657

    Dashboard / Vulnerabilities / CVE-2021-3657

    CVE-2021-3657

    Published: 18 Feb 2022Last Modified: 15 Mar 2026

    Summary:

    Details: 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.

    References: https://www.openwall.com/lists/oss-security/2021/12/03/1, https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html, https://security.gentoo.org/glsa/202208-15, https://bugzilla.redhat.com/show_bug.cgi?id=2028932

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: N/A

    Events:

    Introduced- None
    Fixed -None

    Affected versions

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2021-3657 | CVE-DB