CVE-2021-3448

MEDIUM

dnsmasq < 2.85 - DNS Cache Poisoning via Fixed Port Query Forwarding

Title source: llm
STIX 2.1

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.

References (6)

Core 6
Core References
Exploit, Issue Tracking, Patch, Third Party Advisory x_refsource_misc
https://bugzilla.redhat.com/show_bug.cgi?id=1939368
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/202105-20
Patch, Third Party Advisory x_refsource_misc
https://www.oracle.com/security-alerts/cpujan2022.html

Scores

CVSS v3 4.0
EPSS 0.0199
EPSS Percentile 78.0%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-358
Status published
Products (6)
fedoraproject/fedora 32
fedoraproject/fedora 33
fedoraproject/fedora 34
oracle/communications_cloud_native_core_network_function_cloud_native_environment 1.9.0
redhat/enterprise_linux 8.0
thekelleys/dnsmasq < 2.85
Published Apr 08, 2021
Tracked Since Feb 18, 2026