CVE-2016-6171

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.

Category

8.6
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 1.20% Top 25%
Vendor Advisory nic.cz
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.openwall.com/lists/oss-security/2016/07/06/3 third party advisory mailing list
http://www.securityfocus.com/bid/91678 third party advisory vdb entry
https://lists.dns-oarc.net/pipermail/dns-operations/2016-July/015058.html mailing list technical description
http://www.openwall.com/lists/oss-security/2016/07/06/4 third party advisory mailing list
https://gitlab.labs.nic.cz/labs/knot/blob/c546a70563ef4c7badb7cb5bdf6d1ba8e7adae82/NEWS release notes vdb entry
https://gitlab.labs.nic.cz/labs/knot/issues/464 vendor advisory
https://github.com/sischkg/xfer-limit/blob/master/README.md third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2016-6171?
CVE-2016-6171 has been scored as a high severity vulnerability.
How to fix CVE-2016-6171?
To fix CVE-2016-6171, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-6171 being actively exploited in the wild?
It is possible that CVE-2016-6171 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~1% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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