ALPINE-CVE-2020-25684

ALPINE-CVE-2020-25684

This page contains facts from public vulnerability sources. Check the original advisory before updating.

A flaw was found in dnsmasq before version 2.83. When getting a reply from a forwarded query, dnsmasq checks in the forward.c:reply_query() if the reply destination address/port is used by the pending forwarded queries. However, it does not use the address/port to retrieve the exact forwarded query, substantially reducing the number of attempts an attacker on the network would have to perform to forge a reply and get it accepted by dnsmasq. This issue contrasts with RFC5452, which specifies a query's attributes that all must be used to match a reply. This flaw allows an attacker to perform a DNS Cache Poisoning attack. If chained with CVE-2020-25685 or CVE-2020-25686, the attack complexity of a successful attack is reduced. The highest threat from this vulnerability is to data integrity.

CVSS 3.7 · Low · Fix available

Published

2021-01-20T16:15:14.163Z

Updated

2026-10-26T11:17:55.155979928Z

Stack: system

Check your server →