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CVE-2021-3657

Date: February 18, 2022

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.

Severity Score

Related Resources (10)

https://security.gentoo.org/glsa/202208-15
https://www.openwall.com/lists/oss-security/2021/12/03/1
https://nvd.nist.gov/vuln/detail/CVE-2021-3657
https://security-tracker.debian.org/tracker/CVE-2021-3657
https://lists.debian.org/debian-lts-announce/2022/07/msg00001.html
https://bugzilla.redhat.com/show_bug.cgi?id=2028932
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3657
https://access.redhat.com/security/cve/CVE-2021-3657
https://security.alpinelinux.org/vuln/CVE-2021-3657
https://www.mend.io/vulnerability-database/CVE-2021-3657

Severity Score

Weakness Type (CWE)

Buffer Errors

CWE-119

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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