CVE-2020-12663

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

7.5 HighFix available

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

3.59%Up 1.3 points since Apr 14, 2021

What each source reports

NVD Score used 7.5

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: CVE-2020-12663
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness: CWE-835
Updated: 2026-11-02

CVE List No score

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: CVE-2020-12663
Updated: 2026-11-02

EUVDEUVD-2020-4962 No score

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: EUVD-2020-4962
Updated: 2026-11-03

GitHub AdvisoriesGHSA-rhjg-fh2p-jpv5 No score

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: GHSA-rhjg-fh2p-jpv5
Weakness: CWE-835
Updated: 2026-11-02

OSVALPINE-CVE-2020-12663 7.5

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: ALPINE-CVE-2020-12663
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVAZL-6930 7.5

CVE-2020-12663 affecting package unbound for versions less than 1.10.0-5

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: AZL-6930
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

Show 16 moreShow less

OSV 7.5

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: CVE-2020-12663
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2020-12663 7.5

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: DEBIAN-CVE-2020-12663
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:2414 7.5

Red Hat Security Advisory: unbound security update

Record: RHSA-2020:2414
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:2416 7.5

Red Hat Security Advisory: unbound security update

Record: RHSA-2020:2416
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:2418 7.5

Red Hat Security Advisory: unbound security update

Record: RHSA-2020:2418
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:2419 7.5

Red Hat Security Advisory: unbound security update

Record: RHSA-2020:2419
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:2640 7.5

Red Hat Security Advisory: unbound security update

Record: RHSA-2020:2640
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVRHSA-2020:4181 7.5

Red Hat Security Advisory: unbound security update

Record: RHSA-2020:4181
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVUBUNTU-CVE-2020-12663 7.5

Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.

Record: UBUNTU-CVE-2020-12663
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVMGASA-2020-0224 No score

Updated unbound packages fix security vulnerabilities

Updated unbound packages fix security vulnerabilities:

Unbound can be tricked into amplifying an incoming query into a large number of queries directed to a target (CVE-2020-12662).

Malformed answers from upstream name servers can be used to make Unbound unresponsive (CVE-2020-12663).

Record: MGASA-2020-0224
Updated: 2026-11-02

OSVopenSUSE-SU-2020:0912-1 No score

Security update for unbound

This update for unbound fixes the following issues:

CVE-2020-12662: Fixed an issue where unbound could have been tricked into amplifying an incoming query into a large number of queries directed to a target (bsc#1171889).
CVE-2020-12663: Fixed an issue where malformed answers from upstream name servers could have been used to make unbound unresponsive (bsc#1171889).
CVE-2019-18934: Fixed a vulnerability in the IPSec module which could have allowed code execution after receiving a special crafted answer (bsc#1157268).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Record: openSUSE-SU-2020:0912-1
Updated: 2026-11-02

OSVopenSUSE-SU-2020:0913-1 No score

Security update for unbound

This update for unbound fixes the following issues:

CVE-2020-12662: Fixed an issue where unbound could have been tricked into amplifying an incoming query into a large number of queries directed to a target (bsc#1171889).
CVE-2020-12663: Fixed an issue where malformed answers from upstream name servers could have been used to make unbound unresponsive (bsc#1171889).
CVE-2019-18934: Fixed a vulnerability in the IPSec module which could have allowed code execution after receiving a special crafted answer (bsc#1157268).

This update was imported from the SUSE:SLE-15-SP1:Update update project.

Record: openSUSE-SU-2020:0913-1
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11005-1 No score

libunbound8-1.13.2-1.2 on GA media

These are all security issues fixed in the libunbound8-1.13.2-1.2 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11005-1
Updated: 2026-11-02

OSVSUSE-SU-2020:1772-1 No score

Security update for unbound

This update for unbound fixes the following issues:

CVE-2020-12662: Fixed an issue where unbound could have been tricked into amplifying an incoming query into a large number of queries directed to a target (bsc#1171889).
CVE-2020-12663: Fixed an issue where malformed answers from upstream name servers could have been used to make unbound unresponsive (bsc#1171889).
CVE-2019-18934: Fixed a vulnerability in the IPSec module which could have allowed code execution after receiving a special crafted answer (bsc#1157268).

Record: SUSE-SU-2020:1772-1
Updated: 2026-11-02

OSVSUSE-SU-2020:1819-1 No score

Security update for unbound

This update for unbound fixes the following issues:

CVE-2020-12662: Fixed an issue where unbound could have been tricked into amplifying an incoming query into a large number of queries directed to a target (bsc#1171889).
CVE-2020-12663: Fixed an issue where malformed answers from upstream name servers could have been used to make unbound unresponsive (bsc#1171889).
CVE-2019-18934: Fixed a vulnerability in the IPSec module which could have allowed code execution after receiving a special crafted answer (bsc#1157268).

Record: SUSE-SU-2020:1819-1
Updated: 2026-11-02

OSVUSN-4374-1 No score

unbound vulnerabilities

Lior Shafir, Yehuda Afek, and Anat Bremler-Barr discovered that Unbound incorrectly handled certain queries. A remote attacker could use this issue to perform an amplification attack directed at a target. (CVE-2020-12662)

It was discovered that Unbound incorrectly handled certain malformed answers. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service. (CVE-2020-12663)

Record: USN-4374-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`unbound` Alpine:v3.10	before 1.9.1-r8	1.9.1-r8
`unbound` Alpine:v3.11	before 1.9.6-r1	1.9.6-r1
`unbound` Alpine:v3.12	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.13	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.14	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.15	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.16	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.17	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.18	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.19	before 1.10.1-r0	1.10.1-r0

Show 99 moreShow less

Affected packages
Package	Affected	Fixed
`unbound` Alpine:v3.20	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.21	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.22	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.23	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.24	before 1.10.1-r0	1.10.1-r0
`unbound` Alpine:v3.9	before 1.8.3-r4	1.8.3-r4
`unbound` Azure Linux:2	before 1.10.0-5	1.10.0-5
`unbound` Debian:12	before 1.10.1-1	1.10.1-1
`unbound` Debian:13	before 1.10.1-1	1.10.1-1
`unbound` Debian:14	before 1.10.1-1	1.10.1-1
`unbound1.9` Debian:9 From an advisory covering 3 CVEs	before 1.9.0-2+deb10u2~deb9u1	1.9.0-2+deb10u2~deb9u1
`unbound` Debian:10 From an advisory covering 2 CVEs	before 1.9.0-2+deb10u2, plus listed versions 1.9.0-21.9.0-2+deb10u1	1.9.0-2+deb10u2
`unbound` Mageia:7 From an advisory covering 2 CVEs	before 1.10.1-1.mga7	1.10.1-1.mga7
`unbound` Red Hat:enterprise_linux:7::client From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-debuginfo` Red Hat:enterprise_linux:7::client From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-libs` Red Hat:enterprise_linux:7::client From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-devel` Red Hat:enterprise_linux:7::client From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-python` Red Hat:enterprise_linux:7::client From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound` Red Hat:enterprise_linux:7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-debuginfo` Red Hat:enterprise_linux:7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-libs` Red Hat:enterprise_linux:7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-devel` Red Hat:enterprise_linux:7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-python` Red Hat:enterprise_linux:7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound` Red Hat:enterprise_linux:7::server From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-debuginfo` Red Hat:enterprise_linux:7::server From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-libs` Red Hat:enterprise_linux:7::server From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-devel` Red Hat:enterprise_linux:7::server From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-python` Red Hat:enterprise_linux:7::server From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound` Red Hat:enterprise_linux:7::workstation From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-debuginfo` Red Hat:enterprise_linux:7::workstation From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-libs` Red Hat:enterprise_linux:7::workstation From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-devel` Red Hat:enterprise_linux:7::workstation From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`unbound-python` Red Hat:enterprise_linux:7::workstation From an advisory covering 2 CVEs	before 0:1.6.6-4.el7_8	0:1.6.6-4.el7_8
`python3-unbound` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`python3-unbound-debuginfo` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`unbound` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`unbound-debuginfo` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`unbound-debugsource` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`unbound-devel` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`unbound-libs` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`unbound-libs-debuginfo` Red Hat:enterprise_linux:8::appstream From an advisory covering 2 CVEs	before 0:1.7.3-11.el8_2	0:1.7.3-11.el8_2
`python3-unbound` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`python3-unbound-debuginfo` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`unbound` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`unbound-debuginfo` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`unbound-debugsource` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`unbound-devel` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`unbound-libs` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`unbound-libs-debuginfo` Red Hat:rhel_e4s:8.0::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_0	0:1.7.3-9.el8_0
`python3-unbound` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`python3-unbound-debuginfo` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound-debuginfo` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound-debugsource` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound-devel` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound-libs` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound-libs-debuginfo` Red Hat:rhel_eus:8.1::appstream From an advisory covering 2 CVEs	before 0:1.7.3-9.el8_1	0:1.7.3-9.el8_1
`unbound` Red Hat:enterprise_linux:6::client From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-debuginfo` Red Hat:enterprise_linux:6::client From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-libs` Red Hat:enterprise_linux:6::client From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-devel` Red Hat:enterprise_linux:6::client From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-python` Red Hat:enterprise_linux:6::client From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound` Red Hat:enterprise_linux:6::server From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-debuginfo` Red Hat:enterprise_linux:6::server From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-libs` Red Hat:enterprise_linux:6::server From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-devel` Red Hat:enterprise_linux:6::server From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-python` Red Hat:enterprise_linux:6::server From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound` Red Hat:enterprise_linux:6::workstation From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-debuginfo` Red Hat:enterprise_linux:6::workstation From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-libs` Red Hat:enterprise_linux:6::workstation From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-devel` Red Hat:enterprise_linux:6::workstation From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound-python` Red Hat:enterprise_linux:6::workstation From an advisory covering 2 CVEs	before 0:1.4.20-29.el6_10.1	0:1.4.20-29.el6_10.1
`unbound` Red Hat:rhel_eus:7.7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-debuginfo` Red Hat:rhel_eus:7.7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-libs` Red Hat:rhel_eus:7.7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-devel` Red Hat:rhel_eus:7.7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-python` Red Hat:rhel_eus:7.7::computenode From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound` Red Hat:rhel_eus:7.7::server From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-debuginfo` Red Hat:rhel_eus:7.7::server From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-libs` Red Hat:rhel_eus:7.7::server From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-devel` Red Hat:rhel_eus:7.7::server From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound-python` Red Hat:rhel_eus:7.7::server From an advisory covering 2 CVEs	before 0:1.6.6-2.el7_7	0:1.6.6-2.el7_7
`unbound` SUSE:Linux Enterprise Module for Basesystem 15 SP1 From an advisory covering 3 CVEs	before 1.6.8-10.3.1	1.6.8-10.3.1
`unbound` SUSE:Linux Enterprise Module for Basesystem 15 SP2 From an advisory covering 3 CVEs	before 1.6.8-10.3.1	1.6.8-10.3.1
`unbound` SUSE:Linux Enterprise High Performance Computing 15-ESPOS From an advisory covering 3 CVEs	before 1.6.8-3.6.1	1.6.8-3.6.1
`unbound` SUSE:Linux Enterprise High Performance Computing 15-LTSS From an advisory covering 3 CVEs	before 1.6.8-3.6.1	1.6.8-3.6.1
`unbound` SUSE:Linux Enterprise Server 15-LTSS From an advisory covering 3 CVEs	before 1.6.8-3.6.1	1.6.8-3.6.1
`unbound` SUSE:Linux Enterprise Server for SAP Applications 15 From an advisory covering 3 CVEs	before 1.6.8-3.6.1	1.6.8-3.6.1
`unbound` Ubuntu:Pro:14.04:LTS	All versions, plus listed versions 1.4.20-11.4.21-11.4.21-1ubuntu11.4.21-1ubuntu21.4.22-1ubuntu1 Show 11 moreShow less 1.4.22-1ubuntu21.4.22-1ubuntu31.4.22-1ubuntu41.4.22-1ubuntu4.14.04.11.4.22-1ubuntu4.14.04.21.4.22-1ubuntu4.14.04.31.4.22-1ubuntu4.14.04.3+esm11.4.22-1ubuntu4.14.04.3+esm21.4.22-1ubuntu4.14.04.3+esm31.4.22-1ubuntu4.14.04.3+esm41.4.22-1ubuntu4.14.04.3+esm5	None known
`unbound` Ubuntu:Pro:16.04:LTS	All versions, plus listed versions 1.4.22-1ubuntu61.5.7-1ubuntu11.5.7-1ubuntu21.5.8-1ubuntu11.5.8-1ubuntu1.1 Show 5 moreShow less 1.5.8-1ubuntu1.1+esm11.5.8-1ubuntu1.1+esm21.5.8-1ubuntu1.1+esm31.5.8-1ubuntu1.1+esm41.5.8-1ubuntu1.1+esm5	None known
`unbound` Ubuntu:18.04:LTS	before 1.6.7-1ubuntu2.3, plus listed versions 1.6.5-11.6.7-11.6.7-1build11.6.7-1ubuntu11.6.7-1ubuntu21.6.7-1ubuntu2.11.6.7-1ubuntu2.2	1.6.7-1ubuntu2.3
`unbound` Ubuntu:20.04:LTS	before 1.9.4-2ubuntu1.1, plus listed versions 1.9.0-2ubuntu11.9.0-2ubuntu21.9.4-21.9.4-2ubuntu1	1.9.4-2ubuntu1.1
`unbound` Ubuntu:18.04:LTS From an advisory covering 2 CVEs	before 1.6.7-1ubuntu2.3, plus listed versions 1.6.5-11.6.7-11.6.7-1build11.6.7-1ubuntu11.6.7-1ubuntu21.6.7-1ubuntu2.11.6.7-1ubuntu2.2	1.6.7-1ubuntu2.3
`unbound` Ubuntu:20.04:LTS From an advisory covering 2 CVEs	before 1.9.4-2ubuntu1.1, plus listed versions 1.9.0-2ubuntu11.9.0-2ubuntu21.9.4-21.9.4-2ubuntu1	1.9.4-2ubuntu1.1
`libunbound-devel-mini` openSUSE:Leap 15.1 From an advisory covering 3 CVEs	before 1.6.8-lp151.8.3.1	1.6.8-lp151.8.3.1
`unbound` openSUSE:Leap 15.1 From an advisory covering 3 CVEs	before 1.6.8-lp151.8.3.1	1.6.8-lp151.8.3.1
`libunbound-devel-mini` openSUSE:Leap 15.2 From an advisory covering 3 CVEs	before 1.6.8-lp152.9.3.1	1.6.8-lp152.9.3.1
`unbound` openSUSE:Leap 15.2 From an advisory covering 3 CVEs	before 1.6.8-lp152.9.3.1	1.6.8-lp152.9.3.1
`unbound` openSUSE:Tumbleweed From an advisory covering 6 CVEs	before 1.13.2-1.2	1.13.2-1.2

History

History
Recorded	Changed	Sources
Nov 6, 2026	affected, facts
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2020-12663 is a high vulnerability (CVSS 7.5) in Nlnetlabs Unbound, published May 19, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.59%, the 89th percentile. Fixed in unbound 1.9.1-r8.

References

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