CVE-2020-12662
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.
02 Description
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.
03 Exploitation and scoring
- Exploitation
- Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
- SSVC decision
- Not assessed by CISA
- EPSS probability
- 3.19% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 88.0% of scored records. A rank, not a probability.
- NVD base score
- 7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Important. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2020-05-19 13:50Z6 YR AGO
- Last updated
- 2024-08-04 12:04Z2 YR AGO
- Reserved
- 2020-05-05
- Assigning CNA
- mitre
- Record state
- PUBLISHED
- Severity
- Not rated by the issuing CNA
- CNA CVSS vector
- Not published by the issuing CNA
- Weaknesses
- Data version
- 5.1
- Document digest
- e822091ec5387db0e0cc7698fbfc9a71751bdec03ebb64f218bb5731f646a26c
05 Affected products
06 References
- nlnetlabs.nlhttps://nlnetlabs.nl/downloads/unbound/CVE-2020-12662_2020-12663.txt
- www.nxnsattack.comhttp://www.nxnsattack.com
- www.openwall.com[oss-security] 20200519 Unbound - CVE-2020-12662, CVE-2020-12663http://www.openwall.com/lists/oss-security/2020/05/19/5
- lists.fedoraproject.orgFEDORA-2020-3cfd38fefdhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F5NFROI2OMCZLYRTCNGHGO3TUD32LCIQ/
- www.debian.orgDSA-4694https://www.debian.org/security/2020/dsa-4694
- lists.fedoraproject.orgFEDORA-2020-8e9b62948ehttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YJ42N2HBZ3DXMSEC56SWIIOFQGOS5M7I/
- www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_20_12
- usn.ubuntu.comUSN-4374-1https://usn.ubuntu.com/4374-1/
- lists.opensuse.orgopenSUSE-SU-2020:0912http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.html
- lists.opensuse.orgopenSUSE-SU-2020:0913http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20200702-0006/
- security.freebsd.orgFreeBSD-SA-20:19https://security.FreeBSD.org/advisories/FreeBSD-SA-20:19.unbound.asc
- lists.debian.org[debian-lts-announce] 20210212 [SECURITY] [DLA 2556-1] unbound1.9 security updatehttps://lists.debian.org/debian-lts-announce/2021/02/msg00017.html
07 Fixed in
Arch Linux
- unbound Fixed in 1.10.1-1
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
Debian 12
- unbound Fixed in 1.10.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- unbound Fixed in 1.10.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- unbound Fixed in 1.10.1-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- unbound Fixed in 1.6.7-1ubuntu2.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- unbound Fixed in 1.9.4-2ubuntu1.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- unbound No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 16.04 LTS
- unbound No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.