CVE-2020-8623

Name: CVE-2020-8623
Creator: NVD / NIST
Published: 2020-08-21T21:15:12.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 6.35%

Last modified Jun 17, 2026

CVE-2020-8623 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker. EPSS estimates a 6.35% chance of exploitation in the next 30 days.

Description

In BIND 9.10.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.10.5-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker that can reach a vulnerable system with a specially crafted query packet can trigger a crash. To be vulnerable, the system must: * be running BIND that was built with "--enable-native-pkcs11" * be signing one or more zones with an RSA key * be able to receive queries from a possible attacker

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

6.35%

92.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-617

Affected Software

Vendor	Product	Versions	Update
Isc	Bind	>= 9.10.0, <= 9.11.21	—
Isc	Bind	>= 9.12.1, <= 9.16.5	—
Isc	Bind	>= 9.17.0, <= 9.17.3	—
Isc	Bind	9.10.5	S1
Isc	Bind	9.11.21	S1
Fedoraproject	Fedora	31	—
Fedoraproject	Fedora	32	—
Opensuse	Leap	15.1	—
Opensuse	Leap	15.2	—
Debian	Debian Linux	9.0	—
Debian	Debian Linux	10.0	—
Canonical	Ubuntu Linux	16.04	—
Canonical	Ubuntu Linux	18.04	—
Canonical	Ubuntu Linux	20.04	—
Synology	Dns Server	< 2.2.2-5027	—
Netapp	Steelstore Cloud Integrated Storage	All versions	—

References

http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing List, Third Party Advisory
https://kb.isc.org/docs/cve-2020-8623Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00053.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/
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.debian.org/security/2020/dsa-4752Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_19Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00041.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-10/msg00044.htmlMailing List, Third Party Advisory
https://kb.isc.org/docs/cve-2020-8623Vendor Advisory
https://lists.debian.org/debian-lts-announce/2020/08/msg00053.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/
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.debian.org/security/2020/dsa-4752Third 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-2020-8623?

How severe is CVE-2020-8623?

CVE-2020-8623 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 6.35% probability of exploitation in the next 30 days.

How do I fix CVE-2020-8623?

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-2020-8623?

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

Scan your code now

Source: NVD / NIST