CVE-2021-44143

high-risk

Published 2021-11-22

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.

Do I need to act?

7.8% chance of exploitation in next 30 days

EPSS score — moderate exploit probability

Not on CISA KEV list

No confirmed active exploitation reported to CISA

Patch status unknown

Check vendor advisories for fix availability and mitigation guidance

CVSS 9.8/10 Critical

NETWORK / LOW complexity

Affected Products (6)

Isync

Debian Linux

Fedora

Affected Vendors

Debian Fedoraproject Isync Project

References (14)

Mailing List http://www.openwall.com/lists/oss-security/2021/12/03/2

Third Party Advisory https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999804

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.gentoo.org/glsa/202208-15

Patch https://sourceforge.net/p/isync/isync/commit_browser

Third Party Advisory https://sourceforge.net/p/isync/isync/ref/master/tags/

Mailing List http://www.openwall.com/lists/oss-security/2021/12/03/2

Third Party Advisory https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=999804

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...

Third Party Advisory https://security.gentoo.org/glsa/202208-15

Patch https://sourceforge.net/p/isync/isync/commit_browser

Third Party Advisory https://sourceforge.net/p/isync/isync/ref/master/tags/

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high-risk

Severity 32/34 · Critical

Exploitability 10/34 · Low

Exposure 13/34 · Low