Critical severity9.8NVD Advisory· Published Nov 22, 2021· Updated Jun 17, 2026
CVE-2021-44143
CVE-2021-44143
Description
A flaw was found in mbsync in isync 1.4.0 through 1.4.3. Due to an unchecked condition, a malicious or compromised IMAP server could use a crafted mail message that lacks headers (i.e., one that starts with an empty line) to provoke a heap overflow, which could conceivably be exploited for remote code execution.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
9cpe:2.3:a:isync_project:isync:*:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:a:isync_project:isync:*:*:*:*:*:*:*:*range: >=1.4.0,<=1.4.3
- (no CPE)range: 1.4.0 - 1.4.3
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*+ 1 more
- cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
- isync/mbsyncdescription
Patches
Vulnerability mechanics
References
7- sourceforge.net/p/isync/isync/commit_browsernvdPatchThird Party Advisory
- bugs.debian.org/cgi-bin/bugreport.cginvdThird Party Advisory
- security.gentoo.org/glsa/202208-15nvdThird Party Advisory
- sourceforge.net/p/isync/isync/ref/master/tags/nvdThird Party Advisory
- www.openwall.com/lists/oss-security/2021/12/03/2nvdMailing List
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CYZ2GNB4ZO2T27D2XNUWMCS3THZYSJQU/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LCBSY7OZ57XNC6ZYXF6WU5KBSWITZVDX/nvd
News mentions
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