Debian Security Advisory

DLA-2355-1 bind9 -- LTS security update

Date Reported:
29 Aug 2020
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2020-8622, CVE-2020-8623.
More information:

Two issues have been found in bind9, an Internet Domain Name Server.

  • CVE-2020-8622

    Crafted responses to TSIG-signed requests could lead to an assertion failure, causing the server to exit. This could be done by malicious server operators or guessing attackers.

  • CVE-2020-8623

    An assertions failure, causing the server to exit, can be exploited by a query for an RSA signed zone.

    For Debian 9 stretch, these problems have been fixed in version 1:9.10.3.dfsg.P4-12.3+deb9u7.

    We recommend that you upgrade your bind9 packages.

    For the detailed security status of bind9 please refer to its security tracker page at:

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