Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.
Priority LOW 39CWE-835Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
Unbound before 1.10.1 has an infinite loop via malformed DNS answers received from upstream servers.
Why it matters now
EPSS 0.03588 89th percentileScored 2026-11-07
Fix Fixed Red Hat: 6 advisories
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 10
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* | before 1.10.1 | Vulnerable | NLNETLABS |
| cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* | 15.1 | Vulnerable | openSUSE |
| cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* | 15.2 | Vulnerable | openSUSE |
| cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* | 18.04 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* | 19.10 | Vulnerable | Canonical |
| cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* | 20.04 | Vulnerable | Canonical |
| cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* | 31 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* | 32 | Vulnerable | Fedoraproject |
- cpe:2.3:a:nlnetlabs:unbound:*:*:*:*:*:*:*:* Versions before 1.10.1 Vulnerable ·NLNETLABS
- cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:opensuse:leap:15.1:*:*:*:*:*:*:* Versions 15.1 Vulnerable ·openSUSE
- cpe:2.3:o:opensuse:leap:15.2:*:*:*:*:*:*:* Versions 15.2 Vulnerable ·openSUSE
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:* Versions 18.04 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:19.10:*:*:*:*:*:*:* Versions 19.10 Vulnerable ·Canonical
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:* Versions 20.04 Vulnerable ·Canonical
- cpe:2.3:o:fedoraproject:fedora:31:*:*:*:*:*:*:* Versions 31 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:32:*:*:*:*:*:*:* Versions 32 Vulnerable ·Fedoraproject
Remediation
Red Hat 6 advisories
- RHSA-2020:4181 Released 2020-10-06 · Red Hat rating Importantunbound security update
- Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) unbound-1.6.6-2.el7_7, unbound-libs-1.6.6-2.el7_7
- Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) unbound-1.6.6-2.el7_7, unbound-devel-1.6.6-2.el7_7, unbound-python-1.6.6-2.el7_7
- Red Hat Enterprise Linux Server EUS (v. 7.7) unbound-1.6.6-2.el7_7, unbound-libs-1.6.6-2.el7_7, unbound-libs-1.6.6-2.el7_7.ppc
- Red Hat Enterprise Linux Server Optional EUS (v. 7.7) unbound-devel-1.6.6-2.el7_7, unbound-devel-1.6.6-2.el7_7.ppc, unbound-python-1.6.6-2.el7_7
- RHSA-2020:2640 Released 2020-06-22 · Red Hat rating Importantunbound security update
- Red Hat Enterprise Linux Desktop (v. 6) unbound-1.4.20-29.el6_10.1, unbound-libs-1.4.20-29.el6_10.1
- Red Hat Enterprise Linux Desktop Optional (v. 6) unbound-1.4.20-29.el6_10.1, unbound-devel-1.4.20-29.el6_10.1, unbound-python-1.4.20-29.el6_10.1
- Red Hat Enterprise Linux Server (v. 6) unbound-1.4.20-29.el6_10.1, unbound-libs-1.4.20-29.el6_10.1, unbound-libs-1.4.20-29.el6_10.1.ppc
- Red Hat Enterprise Linux Server Optional (v. 6) unbound-devel-1.4.20-29.el6_10.1, unbound-devel-1.4.20-29.el6_10.1.ppc, unbound-python-1.4.20-29.el6_10.1 +1
- Red Hat Enterprise Linux Workstation (v. 6) unbound-1.4.20-29.el6_10.1, unbound-libs-1.4.20-29.el6_10.1
- Red Hat Enterprise Linux Workstation Optional (v. 6) unbound-devel-1.4.20-29.el6_10.1, unbound-python-1.4.20-29.el6_10.1
- RHSA-2020:2419 Released 2020-06-08 · Red Hat rating Importantunbound security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.1) python3-unbound-1.7.3-9.el8_1, unbound-1.7.3-9.el8_1, unbound-devel-1.7.3-9.el8_1 +1
Show 3 more Red Hat advisories
- RHSA-2020:2418 Released 2020-06-08 · Red Hat rating Importantunbound security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.0) python3-unbound-1.7.3-9.el8_0, unbound-1.7.3-9.el8_0, unbound-devel-1.7.3-9.el8_0 +1
- RHSA-2020:2416 Released 2020-06-08 · Red Hat rating Importantunbound security update
- Red Hat Enterprise Linux AppStream (v. 8) python3-unbound-1.7.3-11.el8_2, unbound-1.7.3-11.el8_2, unbound-devel-1.7.3-11.el8_2 +1
- RHSA-2020:2414 Released 2020-06-08 · Red Hat rating Importantunbound security update
- Red Hat Enterprise Linux Client (v. 7) unbound-1.6.6-4.el7_8, unbound-libs-1.6.6-4.el7_8
- Red Hat Enterprise Linux Client Optional (v. 7) unbound-devel-1.6.6-4.el7_8, unbound-python-1.6.6-4.el7_8
- Red Hat Enterprise Linux ComputeNode (v. 7) unbound-1.6.6-4.el7_8, unbound-libs-1.6.6-4.el7_8
- Red Hat Enterprise Linux ComputeNode Optional (v. 7) unbound-1.6.6-4.el7_8, unbound-devel-1.6.6-4.el7_8, unbound-python-1.6.6-4.el7_8
- Red Hat Enterprise Linux Server (v. 7) unbound-1.6.6-4.el7_8, unbound-libs-1.6.6-4.el7_8, unbound-libs-1.6.6-4.el7_8.ppc
- Red Hat Enterprise Linux Server Optional (v. 7) unbound-devel-1.6.6-4.el7_8, unbound-devel-1.6.6-4.el7_8.ppc, unbound-python-1.6.6-4.el7_8
- Red Hat Enterprise Linux Workstation (v. 7) unbound-1.6.6-4.el7_8, unbound-libs-1.6.6-4.el7_8
- Red Hat Enterprise Linux Workstation Optional (v. 7) unbound-devel-1.6.6-4.el7_8, unbound-python-1.6.6-4.el7_8
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2020:2416 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.0) | Fixed | RHSA-2020:2418 |
| Red Hat Enterprise Linux AppStream EUS (v. 8.1) | Fixed | RHSA-2020:2419 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux ComputeNode (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux ComputeNode EUS (v. 7.7) | Fixed | RHSA-2020:4181 |
| Red Hat Enterprise Linux ComputeNode Optional (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.7) | Fixed | RHSA-2020:4181 |
| Red Hat Enterprise Linux Desktop (v. 6) | Fixed | RHSA-2020:2640 |
| Red Hat Enterprise Linux Desktop Optional (v. 6) | Fixed | RHSA-2020:2640 |
| Red Hat Enterprise Linux Server (v. 6) | Fixed | RHSA-2020:2640 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux Server EUS (v. 7.7) | Fixed | RHSA-2020:4181 |
| Red Hat Enterprise Linux Server Optional (v. 6) | Fixed | RHSA-2020:2640 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux Server Optional EUS (v. 7.7) | Fixed | RHSA-2020:4181 |
| Red Hat Enterprise Linux Workstation (v. 6) | Fixed | RHSA-2020:2640 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2020:2414 |
| Red Hat Enterprise Linux Workstation Optional (v. 6) | Fixed | RHSA-2020:2640 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2020:2414 |
Timeline
- 2026-10-02 Threatist record created from CVE-2020-12663
- 2026-10-03 Alias added: GHSA-rhjg-fh2p-jpv5
References
Sources
- CVE-2020-12663 · CVE Program
- CVE-2020-12663 · NVD
- FIRST EPSS
- GHSA-rhjg-fh2p-jpv5 · GitHub Advisory Database · CC BY 4.0
- CVE-2020-12663 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences