CVE-2020-8620

Name: CVE-2020-8620
Creator: NVD / NIST
Published: 2020-08-21T21:15:12.09+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 3.66%

Last modified Jun 17, 2026

CVE-2020-8620 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.66% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

3.66%

88.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions	Update
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	All versions	—
Canonical	Ubuntu Linux	12.04	—
Canonical	Ubuntu Linux	16.04	—
Canonical	Ubuntu Linux	18.04	—

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlThird Party Advisory
https://kb.isc.org/docs/cve-2020-8620Vendor Advisory
https://security.gentoo.org/glsa/202008-19Third Party Advisory
https://security.netapp.com/advisory/ntap-20200827-0003/Third Party Advisory
https://usn.ubuntu.com/4468-1/Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_19Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlThird Party Advisory
https://kb.isc.org/docs/cve-2020-8620Vendor Advisory
https://security.gentoo.org/glsa/202008-19Third Party Advisory
https://security.netapp.com/advisory/ntap-20200827-0003/Third Party Advisory
https://usn.ubuntu.com/4468-1/Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_19Third Party Advisory

Timeline

Published: Aug 21, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-8620?

How severe is CVE-2020-8620?

CVE-2020-8620 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.66% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8620?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-8620?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST