In BIND 9.15.6 -> 9.16.5, 9.17.0 -> 9.17.3, An attacker who can establish a TCP connection with the server and send data on that connection can exploit this to trigger the assertion failure, causing the server to exit.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-8620
• https://kb.isc.org/docs/cve-2020-8620
• https://security.gentoo.org/glsa/202008-19
• https://security.netapp.com/advisory/ntap-20200827-0003/
• https://usn.ubuntu.com/4468-1/
• https://www.synology.com/security/advisory/Synology_SA_20_19
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html
• http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html