A bind9 security update has been released for Debian GNU/Linux 9 LTS to address the possibility of a buffer overflow attack.

DLA 2568-1: bind9 security update

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Debian LTS Advisory DLA-2568-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
February 19, 2021   https://wiki.debian.org/LTS
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Package : bind9
Version : 1:9.10.3.dfsg.P4-12.3+deb9u8
CVE ID : CVE-2020-8625
Debian Bug : #983004

It was discovered that there was a buffer overflow attack in the
bind9 DNS server caused by an issue in the GSSAPI ("Generic Security
Services") security policy negotiation.

For Debian 9 "Stretch", this problem has been fixed in version
1:9.10.3.dfsg.P4-12.3+deb9u8.

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/bind9

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