Detections
Analytics

CVE-2020-12667

high

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.

References

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/

http://www.openwall.com/lists/oss-security/2020/05/19/2

http://cyber-security-group.cs.tau.ac.il/#

https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html

https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html

https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/

Details

Source: Mitre, NVD

Published: 2020-05-19

Updated: 2024-11-21

Risk Information

CVSS v2

Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:P

Severity: Medium

CVSS v3

Base Score: 7.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Severity: High

EPSS

EPSS: 0.01378