Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an…
Priority LOW 39CWE-400Published · 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-400.
Summary
Unbound before 1.10.1 has Insufficient Control of Network Message Volume, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
Why it matters now
EPSS 0.03197 88th 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-2020-12662
- 2026-10-03 Alias added: GHSA-w2pr-2387-vxgh
References
Advisory 11
- https://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_2020-12663.txt
- FEDORA-2020-3cfd38fefd
- DSA-4694
- FEDORA-2020-8e9b62948e
- https://www.synology.com/security/advisory/Synology_SA_20_12
- USN-4374-1
- openSUSE-SU-2020:0912
- openSUSE-SU-2020:0913
- https://security.netapp.com/advisory/ntap-20200702-0006/
- FreeBSD-SA-20:19
- [debian-lts-announce] 20210212 [SECURITY] [DLA 2556-1] unbound1.9 security update
Other 1
Sources
- CVE-2020-12662 · CVE Program
- CVE-2020-12662 · NVD
- FIRST EPSS
- GHSA-w2pr-2387-vxgh · GitHub Advisory Database · CC BY 4.0
- CVE-2020-12662 · Red Hat security data · CC BY 4.0
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