CVE-2021-3448 - CVE House
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Status published Unknown CVE-2021-3448

A flaw was found in dnsmasq in versions before 2.85....

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Affected Software

dnsmasq
Vulnerable Versions:
dnsmasq 2.85

Timeline

Official Publish: April 8th, 2021
Last Modified: December 3rd, 2025
Added to House: July 21st, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

CWE-358

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.