CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
85.2%
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.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
ubuntu | 18.04 | noarch | knot-resolver | < any | UNKNOWN |
ubuntu | 20.04 | noarch | knot-resolver | < any | UNKNOWN |
ubuntu | 16.04 | noarch | knot-resolver | < any | UNKNOWN |
cyber-security-group.cs.tau.ac.il/#
www.openwall.com/lists/oss-security/2020/05/19/2
en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/
launchpad.net/bugs/cve/CVE-2020-12667
nvd.nist.gov/vuln/detail/CVE-2020-12667
security-tracker.debian.org/tracker/CVE-2020-12667
www.cve.org/CVERecord?id=CVE-2020-12667
www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
85.2%