CVE-2021-3657

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.

• CWE-119
• CWE-119

• https://bugzilla.redhat.com/show_bug.cgi?id=2028932Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202208-15Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/12/03/1Mailing List, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2028932Issue Tracking, Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2022/07/msg00001.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/202208-15Third Party Advisory
• https://www.openwall.com/lists/oss-security/2021/12/03/1Mailing List, Third Party Advisory

Published

Feb 18, 2022

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
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