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medium 6.5

CVE-2020-8622 json

A truncated TSIG response can lead to an assertion failure

published 6y ago modified 4mo ago also EUVD-2020-29470

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
5.9%
EPSS 5.9% chance of exploitation in 30 days, percentile 93%
public exploits
0
none known

Summary

In BIND 9.0.0 -> 9.11.21, 9.12.0 -> 9.16.5, 9.17.0 -> 9.17.3, also affects 9.9.3-S1 -> 9.11.21-S1 of the BIND 9 Supported Preview Edition, An attacker on the network path for a TSIG-signed request, or operating the server receiving the TSIG-signed request, could send a truncated response to that request, triggering an assertion failure, causing the server to exit. Alternately, an off-path attacker would have to correctly guess when a TSIG-signed request was sent, along with other characteristics of the packet and message, and spoof a truncated response to trigger an assertion failure, causing the server to exit.

Patch / fix

  • ISC BIND9 9.11.22, 9.11.22-S1, 9.16.6, 9.17.4
  • bind9 Debian 14, Debian 13, Debian 12 1:9.16.6-1

debian advisories DEBIAN-CVE-2020-8622

  • 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
  • bind9 Ubuntu Pro 14.04 LTS 1:9.9.5.dfsg-3ubuntu0.19+esm3

ubuntu advisories UBUNTU-CVE-2020-8622

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-2020:5203RHSA-2020:5011RHSA-2020:4992RHSA-2020:4500RHSA-2020:4183

  • bind SLES for SAP 12 SP3, SLES 12 SP3-LTSS, SLES 12 SP3-BCL +4 more 9.9.9P1-63.28.1
  • 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-SU-2021:2876-1SUSE-RU-2020:2915-1SUSE-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-2024:10650-1openSUSE-SU-2020:1701-1openSUSE-SU-2020:1699-1

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

alpine advisories ALPINE-CVE-2020-8622

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

Is CVE-2020-8622 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2020-8622 updated cvss 6.5

bind: truncated TSIG response can lead to an assertion failure

  • Red Hat Enterprise Linux 5 bind, bind97
    affected: no fix planned “Out of support scope”
  • 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
show 14 more
  • Red Hat Enterprise Linux Desktop (v. 6) bind 9.8.2-0.68.rc1.el6_10.8, bind-libs 9.8.2-0.68.rc1.el6_10.8, bind-utils 9.8.2-0.68.rc1.el6_10.8 Red Hat Enterprise Linux Desktop Optional (v. 6) bind 9.8.2-0.68.rc1.el6_10.8, bind-sdb 9.8.2-0.68.rc1.el6_10.8, bind-chroot 9.8.2-0.68.rc1.el6_10.8
    fixed: vendor fix RHSA-2020:4183
  • 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
  • Red Hat Enterprise Linux HPC Node (v. 6) bind 9.8.2-0.68.rc1.el6_10.8, bind-libs 9.8.2-0.68.rc1.el6_10.8, bind-utils 9.8.2-0.68.rc1.el6_10.8 Red Hat Enterprise Linux HPC Node Optional (v. 6) bind 9.8.2-0.68.rc1.el6_10.8, bind-sdb 9.8.2-0.68.rc1.el6_10.8, bind-chroot 9.8.2-0.68.rc1.el6_10.8 Red Hat Enterprise Linux Server (v. 6) bind 9.8.2-0.68.rc1.el6_10.8, bind-libs 9.8.2-0.68.rc1.el6_10.8, bind-utils 9.8.2-0.68.rc1.el6_10.8, bind-chroot 9.8.2-0.68.rc1.el6_10.8
    fixed: vendor fix RHSA-2020:4183
  • 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. 6) bind-sdb 9.8.2-0.68.rc1.el6_10.8
    fixed: vendor fix RHSA-2020:4183
  • 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. 6) bind 9.8.2-0.68.rc1.el6_10.8, bind-libs 9.8.2-0.68.rc1.el6_10.8, bind-utils 9.8.2-0.68.rc1.el6_10.8, bind-chroot 9.8.2-0.68.rc1.el6_10.8
    fixed: vendor fix RHSA-2020:4183
  • 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
    fixed: vendor fix RHSA-2020:5011
  • Red Hat Enterprise Linux Workstation Optional (v. 6) bind-sdb 9.8.2-0.68.rc1.el6_10.8
    fixed: vendor fix RHSA-2020:4183
  • 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 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

5.90% 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 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 4.0 AV:N/AC:L/Au:S/C:N/I:N/A:P

Affected products

  • ISC BIND9

Classification

Weakness

References

Sources

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.