An isync security update has been released for Fedora 33.

SECURITY: Fedora 33 Update: isync-1.4.1-1.fc33

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Fedora Update Notification
FEDORA-2021-ef8c2acfce
2021-03-04 20:06:38.965342
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Name : isync
Product : Fedora 33
Version : 1.4.1
Release : 1.fc33
URL :   http://isync.sourceforge.net/
Summary : Tool to synchronize IMAP4 and Maildir mailboxes
Description :
mbsync is a command line application which synchronizes mailboxes. Currently
Maildir and IMAP4 mailboxes are supported. New messages, message deletions
and flag changes can be propagated both ways. mbsync is suitable for use in
IMAP-disconnected mode.

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Update Information:

Update to latest upstream release 1.4.1 (#1931574)
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ChangeLog:

* Mon Feb 22 2021 Fabian Affolter - 1.4.1-1
- Update to latest upstream release 1.4.1 (#1931574)
- Fix CVE-2021-20247 (#1931597, #1931598)
* Thu Feb 4 2021 Fabian Affolter - 1.4.0-1
- Update to latest upstream release 1.4.0 (#1924724)
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References:

[ 1 ] Bug #1931574 - isync-1.4.1 is available
  https://bugzilla.redhat.com/show_bug.cgi?id=1931574
[ 2 ] Bug #1931597 - CVE-2021-20247 isync: isync/mbsync: mailbox names returned by IMAP LIST/LSUB not validated [fedora-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1931597
[ 3 ] Bug #1931598 - CVE-2021-20247 isync: isync/mbsync: mailbox names returned by IMAP LIST/LSUB not validated [epel-all]
  https://bugzilla.redhat.com/show_bug.cgi?id=1931598
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This update can be installed with the "dnf" update program. Use
su -c 'dnf upgrade --advisory FEDORA-2021-ef8c2acfce' at the command
line. For more information, refer to the dnf documentation available at
  http://dnf.readthedocs.io/en/latest/command_ref.html#upgrade-command-label

All packages are signed with the Fedora Project GPG key. More details on the
GPG keys used by the Fedora Project can be found at
  https://fedoraproject.org/keys