Vulnerability 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.
CVSS Score
7.5
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Nic | Knot Resolver | < 5.1.1 |
Related Weaknesses (CWE)
References
- http://cyber-security-group.cs.tau.ac.il/#Technical DescriptionThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/05/19/2Mailing ListThird Party Advisory
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-Technical DescriptionVendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.htmlRelease NotesVendor Advisory
- http://cyber-security-group.cs.tau.ac.il/#Technical DescriptionThird Party Advisory
- http://www.openwall.com/lists/oss-security/2020/05/19/2Mailing ListThird Party Advisory
- https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-Technical DescriptionVendor Advisory
- https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.htmlRelease NotesVendor Advisory
FAQ
What is CVE-2020-12667?
CVE-2020-12667 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2020-12667?
CVE-2020-12667 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-12667?
Check the references section above for vendor advisories and patch information. Affected products include: Nic Knot Resolver.