VYPR
Unrated severityNVD Advisory· Published Apr 8, 2021· Updated Dec 3, 2025

CVE-2021-3448

CVE-2021-3448

Description

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.

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Affected products

36

Patches

Vulnerability mechanics

References

6

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