CVE-2020-12662
HIGHCVSS 7.5/10EPSS 3.17%
Last modified
CVE-2020-12662 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 3.17% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nlnetlabs | Unbound | < 1.10.1 |
| Debian | Debian Linux | 9.0 |
| Debian | Debian Linux | 10.0 |
| Opensuse | Leap | 15.1 |
| Opensuse | Leap | 15.2 |
| Canonical | Ubuntu Linux | 18.04 |
| Canonical | Ubuntu Linux | 19.10 |
| Canonical | Ubuntu Linux | 20.04 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
References
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.htmlMailing List, Third Party Advisory
- http://www.nxnsattack.comTechnical Description
- http://www.openwall.com/lists/oss-security/2020/05/19/5Mailing List, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00017.htmlMailing List, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:19.unbound.ascThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200702-0006/Third Party Advisory
- https://usn.ubuntu.com/4374-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4694Third Party Advisory
- https://www.synology.com/security/advisory/Synology_SA_20_12Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00067.htmlMailing List, Third Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-06/msg00069.htmlMailing List, Third Party Advisory
- http://www.nxnsattack.comTechnical Description
- http://www.openwall.com/lists/oss-security/2020/05/19/5Mailing List, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2021/02/msg00017.htmlMailing List, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-20:19.unbound.ascThird Party Advisory
- https://security.netapp.com/advisory/ntap-20200702-0006/Third Party Advisory
- https://usn.ubuntu.com/4374-1/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4694Third Party Advisory
- https://www.synology.com/security/advisory/Synology_SA_20_12Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is 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.
How severe is CVE-2020-12662?
CVE-2020-12662 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 3.17% probability of exploitation in the next 30 days.
How do I fix CVE-2020-12662?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-12662?
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Scan your code nowSource: NVD / NIST