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)
Scores
CVSS v3
4.0
EPSS
0.0004
EPSS Percentile
12.4%
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