CVE-2021-3448

A flaw was found in dnsmasq in versions before 2.85. When configured to use a specific server for a given network interface, dnsmasq uses a fixed port while forwarding queries. An attacker on the network, able to find the outgoing port used by dnsmasq, only needs to guess the random transmission ID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNS Cache Poisoning attack much easier. The highest threat from this vulnerability is to data integrity.

Score
CVSS 3.1 4.0 Medium
Status
Modified - secalert@redhat.com
Published
2021-04-08
Last modified
2025-12-03
Weaknesses
CWE-358

Affected products

References

 
 
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