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.
Published 2022-02-18 18:15:10
Updated 2022-12-21 15:01:20
View at NVD,   CVE.org
Vulnerability category: OverflowExecute code

Exploit prediction scoring system (EPSS) score for CVE-2021-3657

Probability of exploitation activity in the next 30 days: 0.69%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 78 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2021-3657

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
7.5
HIGH AV:N/AC:L/Au:N/C:P/I:P/A:P
10.0
6.4
NIST
9.8
CRITICAL CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.9
5.9
NIST

CWE ids for CVE-2021-3657

References for CVE-2021-3657

Products affected by CVE-2021-3657

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