CVE-2020-8620: High severity ISC BIND vulnerability

Published Aug 21, 2020
·
Updated

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.

Affected Software

13 affected componentsFixes available
ISC BIND>=9.15.6<=9.16.5
ISC BIND>=9.17.0<=9.17.3
ISC BIND=9.9.12-s1
ISC BIND=9.9.13-s1
ISC BIND=9.11.3-s1
ISC BIND=9.11.21-s1
openSUSE Leap=15.1
openSUSE Leap=15.2
NetApp Steelstore Cloud Integrated Storage
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=16.04
Canonical Ubuntu Linux=18.04
debian/bind9
1:9.16.50-1~deb11u21:9.16.50-1~deb11u41:9.18.41-1~deb12u11:9.18.44-1~deb12u11:9.20.18-1~deb13u11:9.20.20-1

Remediation

Information

Upgrade to the patched release most closely related to your current version of BIND: BIND 9.16.6 BIND 9.17.4

Event History

Aug 21, 2020
CVE Published
via MITRE·08:50 PM
Data Sourced
via MITRE·08:50 PM
RemedyDescriptionSeverityWeakness
Jan 11, 2024
Data Sourced
via Launchpad·11:53 PM
Description
Feb 24, 2026
Data Sourced
via Ubuntu·12:53 AM
RemedyDescriptionSeverityAffected Software
Mar 15, 2026
Data Sourced
via Debian·01:11 AM
DescriptionAffected Software
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is CVE-2020-8620?

CVE-2020-8620 is a vulnerability in BIND, a DNS software, that allows an attacker who can establish a TCP connection with the server to trigger an assertion failure and cause the server to exit.

2

What is the severity of CVE-2020-8620?

The severity of CVE-2020-8620 is high with a CVSS score of 7.5.

3

Which software versions are affected by CVE-2020-8620?

BIND versions 9.15.6 to 9.16.5 and 9.17.0 to 9.17.3 are affected by CVE-2020-8620.

4

How can an attacker exploit CVE-2020-8620?

An attacker who can establish a TCP connection with the vulnerable server can exploit CVE-2020-8620 by sending data on that connection to trigger the assertion failure.

5

Are there any references related to CVE-2020-8620?

Yes, you can find more information about CVE-2020-8620 in the following references: - http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.html - http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.html - https://kb.isc.org/docs/cve-2020-8620

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203