Knot DNS 1.6.x < 1.6.6 / 2.0.x < 2.0.2 NAPTR Record DoS

medium Nessus Plugin ID 87965


The remote DNS server is affected by a denial of service vulnerability.


The Knot DNS server running on the remote host is version 1.6.x prior to 1.6.6 or 2.0.x prior to 2.0.2. It is, therefore, affected by an out-of-bounds read error that occurs when parsing malformed NAPTR records. An unauthenticated, remote attacker can exploit this to disclose memory contents or crash the knotd daemon, resulting in a denial of service.


Upgrade to Knot DNS version 1.6.6 / 2.0.2 or later.

See Also

Plugin Details

Severity: Medium

ID: 87965

File Name: knot_dns_2_0_2.nasl

Version: 1.5

Type: remote

Family: DNS

Published: 1/18/2016

Updated: 11/15/2018

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information


Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

Vulnerability Information

CPE: x-cpe:/a:cz.nic:knot_dns

Required KB Items: Settings/ParanoidReport, knot_dns/proto

Patch Publication Date: 11/24/2015

Vulnerability Publication Date: 11/24/2015