High severity7.5NVD Advisory· Published May 19, 2020· Updated Jun 17, 2026
CVE-2020-12667
CVE-2020-12667
Description
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
2- Knot Resolver/Knot Resolverdescription
- Range: <5.1.1
Patches
Vulnerability mechanics
References
6- cyber-security-group.cs.tau.ac.ilnvdTechnical DescriptionThird Party Advisory
- www.openwall.com/lists/oss-security/2020/05/19/2nvdMailing ListThird Party Advisory
- en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/nvdTechnical DescriptionVendor Advisory
- www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.htmlnvdRelease NotesVendor Advisory
- lists.debian.org/debian-lts-announce/2024/04/msg00017.htmlnvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/nvd
News mentions
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