CVE-2016-6171 Denial of service in n/a
Remote attackers can crash Knot DNS slave servers and exhaust memory by sending large zone transfers via DDNS, AXFR, or IXFR.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2016-6171?
CVE-2016-6171 is a high-severity denial of service vulnerability in n/a, published on 9 Feb 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-400
Which versions are affected by CVE-2016-6171?
It affects 1 product.
Products include Knot-Dns Knot Dns.
How do I fix CVE-2016-6171?
Upgrade to a fixed version.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2016-6171 being exploited?
There is no known exploitation of CVE-2016-6171 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2016-6171, GHSA-935v-fg4c-f9fr, UBUNTU-CVE-2016-6171.