high 7.5

CVE-2020-8623 json

A flaw in native PKCS#11 code can lead to a remotely triggerable assertion failure in pk11.c

published 2020-08-21 6y ago modified 2026-06-17 4mo ago also EUVD-2020-29471

cvss: 7.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 6.6%; EPSS 6.6% chance of exploitation in 30 days, percentile 93%
public exploits: 0; none known

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

Patch / fix

fixed in 1 distros 6

ISC BIND9 9.11.22, 9.11.22-S1, 9.16.6, 9.17.4

debian ubuntu red hat suse opensuse alpine

bind9 Debian 14, Debian 13, Debian 12 1:9.16.6-1

debian advisories DEBIAN-CVE-2020-8623

bind9 Ubuntu 16.04 LTS 1:9.10.3.dfsg.P4-8ubuntu1.17
bind9 Ubuntu 18.04 LTS 1:9.11.3+dfsg-1ubuntu1.13
bind9 Ubuntu 20.04 LTS 1:9.16.1-0ubuntu2.3

ubuntu advisories UBUNTU-CVE-2020-8623

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

bind RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-sdb RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-libs RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-utils RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-chroot RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-pkcs11 RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-license RHEL 7 32:9.11.4-26.P2.el7_9.2
bind-libs-lite RHEL 7 32:9.11.4-26.P2.el7_9.2

red hat advisories RHSA-2020:5203 RHSA-2020:5011 RHSA-2020:4992 RHSA-2020:4500

bind SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +4 more 9.11.22-3.22.1
bind SLES for SAP 15, SLES 15-LTSS, SLE Module for Server Applications 15 SP2 +5 more 9.16.6-12.32.1
sysuser-tools SLES for SAP 15, SLES 15-LTSS, SLE Module for Development Tools 15 SP2 +4 more 2.0-4.2.8

suse advisories SUSE-RU-2020:2915-1 SUSE-SU-2020:2914-1

bind openSUSE Tumbleweed 9.16.20-1.4
bind openSUSE Leap 15.1 9.16.6-lp151.11.9.1
libuv openSUSE Leap 15.1 1.18.0-lp151.3.3.1
sysuser-tools openSUSE Leap 15.1 2.0-lp151.4.3.1
bind openSUSE Leap 15.2 9.16.6-lp152.14.3.1
libuv openSUSE Leap 15.2 1.18.0-lp152.4.3.1
sysuser-tools openSUSE Leap 15.2 2.0-lp152.5.3.1

opensuse advisories openSUSE-SU-2024:10650-1 openSUSE-SU-2020:1701-1 openSUSE-SU-2020:1699-1

bind Alpine 3.24, Alpine 3.23, Alpine 3.22 +12 more 9.16.6-r0

alpine advisories ALPINE-CVE-2020-8623

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2020-8623 updated 2026-11-07 cvss 7.5

bind: remotely triggerable assertion failure in pk11.c

Red Hat Enterprise Linux AppStream (v. 8) bind 9.11.20-5.el8, bind-sdb 9.11.20-5.el8, bind-libs 9.11.20-5.el8, bind-utils 9.11.20-5.el8, bind-chroot 9.11.20-5.el8, bind-pkcs11 9.11.20-5.el8, +6 more Red Hat Enterprise Linux BaseOS (v. 8) bind 9.11.20-5.el8, bind-export-libs 9.11.20-5.el8
fixed: vendor fix RHSA-2020:4500
Red Hat Enterprise Linux Client (v. 7) bind 9.11.4-26.P2.el7_9.2, bind-libs 9.11.4-26.P2.el7_9.2, bind-utils 9.11.4-26.P2.el7_9.2, bind-license 9.11.4-26.P2.el7_9.2, bind-libs-lite 9.11.4-26.P2.el7_9.2, bind-export-libs 9.11.4-26.P2.el7_9.2 Red Hat Enterprise Linux Client Optional (v. 7) bind 9.11.4-26.P2.el7_9.2, bind-sdb 9.11.4-26.P2.el7_9.2, bind-chroot 9.11.4-26.P2.el7_9.2, bind-pkcs11 9.11.4-26.P2.el7_9.2, bind-sdb-chroot 9.11.4-26.P2.el7_9.2, bind-pkcs11-libs 9.11.4-26.P2.el7_9.2, +1 more
fixed: vendor fix RHSA-2020:5011
Red Hat Enterprise Linux ComputeNode EUS (v. 7.6) bind 9.9.4-74.el7_6.5, bind-libs 9.9.4-74.el7_6.5, bind-utils 9.9.4-74.el7_6.5, bind-license 9.9.4-74.el7_6.5, bind-libs-lite 9.9.4-74.el7_6.5
fixed: vendor fix RHSA-2020:4992
Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) bind 9.11.4-9.P2.el7_7.3, bind-libs 9.11.4-9.P2.el7_7.3, bind-utils 9.11.4-9.P2.el7_7.3, bind-license 9.11.4-9.P2.el7_7.3, bind-libs-lite 9.11.4-9.P2.el7_7.3, bind-export-libs 9.11.4-9.P2.el7_7.3
fixed: vendor fix RHSA-2020:5203
Red Hat Enterprise Linux ComputeNode Optional (v. 7) bind 9.11.4-26.P2.el7_9.2, bind-sdb 9.11.4-26.P2.el7_9.2, bind-chroot 9.11.4-26.P2.el7_9.2, bind-pkcs11 9.11.4-26.P2.el7_9.2, bind-sdb-chroot 9.11.4-26.P2.el7_9.2, bind-pkcs11-libs 9.11.4-26.P2.el7_9.2, +1 more
fixed: vendor fix RHSA-2020:5011
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) bind 9.9.4-74.el7_6.5, bind-sdb 9.9.4-74.el7_6.5, bind-chroot 9.9.4-74.el7_6.5, bind-pkcs11 9.9.4-74.el7_6.5, bind-sdb-chroot 9.9.4-74.el7_6.5, bind-pkcs11-libs 9.9.4-74.el7_6.5, +1 more
fixed: vendor fix RHSA-2020:4992
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) bind 9.11.4-9.P2.el7_7.3, bind-sdb 9.11.4-9.P2.el7_7.3, bind-chroot 9.11.4-9.P2.el7_7.3, bind-pkcs11 9.11.4-9.P2.el7_7.3, bind-sdb-chroot 9.11.4-9.P2.el7_7.3, bind-pkcs11-libs 9.11.4-9.P2.el7_7.3, +1 more
fixed: vendor fix RHSA-2020:5203
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7) bind 9.9.4-74.el7_6.5, bind-libs 9.9.4-74.el7_6.5, bind-utils 9.9.4-74.el7_6.5, bind-chroot 9.9.4-74.el7_6.5, bind-pkcs11 9.9.4-74.el7_6.5, bind-license 9.9.4-74.el7_6.5, +3 more Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) bind-sdb 9.9.4-74.el7_6.5, bind-pkcs11 9.9.4-74.el7_6.5, bind-sdb-chroot 9.9.4-74.el7_6.5, bind-pkcs11-libs 9.9.4-74.el7_6.5, bind-pkcs11-utils 9.9.4-74.el7_6.5
fixed: vendor fix RHSA-2020:4992

show 8 more

Red Hat Enterprise Linux Server (v. 7) bind 9.11.4-26.P2.el7_9.2, bind-libs 9.11.4-26.P2.el7_9.2, bind-utils 9.11.4-26.P2.el7_9.2, bind-chroot 9.11.4-26.P2.el7_9.2, bind-pkcs11 9.11.4-26.P2.el7_9.2, bind-license 9.11.4-26.P2.el7_9.2, +4 more
fixed: vendor fix RHSA-2020:5011
Red Hat Enterprise Linux Server EUS (v. 7.6) bind 9.9.4-74.el7_6.5, bind-libs 9.9.4-74.el7_6.5, bind-utils 9.9.4-74.el7_6.5, bind-chroot 9.9.4-74.el7_6.5, bind-pkcs11 9.9.4-74.el7_6.5, bind-license 9.9.4-74.el7_6.5, +3 more
fixed: vendor fix RHSA-2020:4992
Red Hat Enterprise Linux Server EUS (v. 7.7) bind 9.11.4-9.P2.el7_7.3, bind-libs 9.11.4-9.P2.el7_7.3, bind-utils 9.11.4-9.P2.el7_7.3, bind-chroot 9.11.4-9.P2.el7_7.3, bind-pkcs11 9.11.4-9.P2.el7_7.3, bind-license 9.11.4-9.P2.el7_7.3, +4 more
fixed: vendor fix RHSA-2020:5203
Red Hat Enterprise Linux Server Optional (v. 7) bind-sdb 9.11.4-26.P2.el7_9.2, bind-sdb-chroot 9.11.4-26.P2.el7_9.2
fixed: vendor fix RHSA-2020:5011
Red Hat Enterprise Linux Server Optional EUS (v. 7.6) bind-sdb 9.9.4-74.el7_6.5, bind-pkcs11 9.9.4-74.el7_6.5, bind-sdb-chroot 9.9.4-74.el7_6.5, bind-pkcs11-libs 9.9.4-74.el7_6.5, bind-pkcs11-utils 9.9.4-74.el7_6.5
fixed: vendor fix RHSA-2020:4992
Red Hat Enterprise Linux Server Optional EUS (v. 7.7) bind-sdb 9.11.4-9.P2.el7_7.3, bind-sdb-chroot 9.11.4-9.P2.el7_7.3
fixed: vendor fix RHSA-2020:5203
Red Hat Enterprise Linux Workstation (v. 7) bind 9.11.4-26.P2.el7_9.2, bind-libs 9.11.4-26.P2.el7_9.2, bind-utils 9.11.4-26.P2.el7_9.2, bind-chroot 9.11.4-26.P2.el7_9.2, bind-pkcs11 9.11.4-26.P2.el7_9.2, bind-license 9.11.4-26.P2.el7_9.2, +4 more Red Hat Enterprise Linux Workstation Optional (v. 7) bind-sdb 9.11.4-26.P2.el7_9.2, bind-sdb-chroot 9.11.4-26.P2.el7_9.2
fixed: vendor fix RHSA-2020:5011
Red Hat Enterprise Linux 5 bind, bind97 Red Hat Enterprise Linux 6 bind, bind-sdb, bind-libs, bind-utils, bind-chroot
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

6.61% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	3.1	7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	4.3	AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

ISC BIND9

Classification

Weakness

CWE-617 Reachable Assertion

References

lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/DQN62GBMCIC5AY4KYADGXNKVY6AJKSJE/
vendor-advisory
usn.ubuntu.com /4468-1/
vendor-advisory, third-party-advisory
debian.org /security/2020/dsa-4752
vendor-advisory, third-party-advisory
lists.fedoraproject.org /archives/list/package-announce%40lists.fedoraproject.org/message/ZKAMJZXR66P6S5LEU4SN7USSNCWTXEXP/
vendor-advisory
security.gentoo.org /glsa/202008-19
vendor-advisory, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-10/msg00041.html
vendor-advisory, mailing-list, third-party-advisory
lists.opensuse.org /opensuse-security-announce/2020-10/msg00044.html
vendor-advisory, mailing-list, third-party-advisory
kb.isc.org /docs/cve-2020-8623
vendor-advisory
security.netapp.com /advisory/ntap-20200827-0003/
third-party-advisory
lists.debian.org /debian-lts-announce/2020/08/msg00053.html
mailing-list, third-party-advisory
synology.com /security/advisory/Synology_SA_20_19
third-party-advisory

Sources

CVE List CVE-2020-8623
NVD CVE-2020-8623

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

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