CVE-2020-25686

A flaw was found in dnsmasq before version 2.83. When receiving a query,
dnsmasq does not check for an existing pending request for the same name
and forwards a new request. By default, a maximum of 150 pending queries
can be sent to upstream servers, so there can be at most 150 queries for
the same name. This flaw allows an off-path attacker on the network to
substantially reduce the number of attempts that it would have to perform
to forge a reply and have it accepted by dnsmasq. This issue is mentioned
in the “Birthday Attacks” section of RFC5452. If chained with
CVE-2020-25684, the attack complexity of a successful attack is reduced.
The highest threat from this vulnerability is to data integrity.