CVE-2020-12667
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2020-12667
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2020-12667.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2020-12667
- Downstream
- Published
- 2020-05-19T13:15:11.763Z
- Modified
- 2025-11-14T10:12:09.563687Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- [none]
- Details
-
Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
- References
-
- https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/
- http://cyber-security-group.cs.tau.ac.il/#
- http://www.openwall.com/lists/oss-security/2020/05/19/2
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
Affected packages
Git / github.com/cz-nic/knot-resolver
Affected ranges
- Type
- GIT
- Repo
- https://github.com/cz-nic/knot-resolver
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixed
Affected versions
1.*
1.3.0-rc1
v1.*
v1.0.0
v1.0.0-beta1
v1.0.0-beta2
v1.0.0-beta3
v1.1.0
v1.1.1
v1.2.0
v1.2.0-rc1
v1.2.0-rc2
v1.2.0-rc3
v1.2.1
v1.2.2
v1.2.3
v1.2.4
v1.2.5
v1.2.6
v1.3.0
v1.3.1
v1.3.2
v1.3.3
v1.4.0
v1.5.0
v1.5.1
v1.5.2
v1.5.3
v1.99.1-alpha
v2.*
v2.0.0
v2.1.0
v2.1.1
v2.2.0
v2.3.0
v2.4.0
v3.*
v3.0.0
v3.1.0
v3.2.0
v3.2.1
v4.*
v4.0.0
v4.1.0
v4.2.0
v4.2.1
v4.2.2
v4.3.0
v5.*
v5.0.0
v5.0.1
v5.1.0