An uw-imap security update has been released for Debian GNU/Linux 9 LTS to address an issue.

DLA 2866-1: uw-imap security update

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Debian LTS Advisory DLA-2866-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
December 29, 2021   https://wiki.debian.org/LTS
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Package : uw-imap
Version : 8:2007f~dfsg-5+deb9u1
CVE ID : CVE-2018-19518
Debian Bug : 914632

Access to IMAP mailboxes through running imapd over rsh and ssh is
now disabled by default in uw-imap, the University of Washington IMAP
Toolkit. Code using the library can enable it with tcp_parameters()
after making sure that the IMAP server name is sanitized.

For Debian 9 stretch, this problem has been fixed in version
8:2007f~dfsg-5+deb9u1.

We recommend that you upgrade your uw-imap packages.

For the detailed security status of uw-imap please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/uw-imap

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS