High severity · published Feb 9, 2017
CVE-2016-6171
Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3)…
8.6
CVSS
2.8%
EPSS
No
On KEV
Description
Knot DNS before 2.3.0 allows remote DNS servers to cause a denial of service (memory exhaustion and slave server crash) via a large zone transfer for (1) DDNS, (2) AXFR, or (3) IXFR.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)2.8% · higher than 86% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
KD
Knot Dns · Knot-dns
before 2.3.0 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2016-6171
CVE.org
https://www.cve.org/CVERecord?id=CVE-2016-6171
Mailing List
http://www.openwall.com/lists/oss-security/2016/07/06/3
Mailing List
http://www.openwall.com/lists/oss-security/2016/07/06/4
Third Party Advisory
http://www.securityfocus.com/bid/91678
Patch
https://github.com/sischkg/xfer-limit/blob/master/README.md
Release Notes
https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWS
Vendor Advisory
https://gitlab.labs.nic.cz/labs/knot/issues/464
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