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CVE-2021-3448

Published: Apr 8, 2021Updated: Dec 3, 2025 Sources: CVE List NVD BDUCWE-358
NVD MITRE
4.0CVSSMEDIUM
EPSS Score
2.0%
Top 22.0%
CISA KEV
Not in KEV
Exploits
1 Known
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:HPR:NUI:NS:CC:NI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:NConfidentiality
None
I:LIntegrity
Low
A:NAvailability
None
Open in CVSS calculator →

Weaknesses

CWE-358NVD-CWE-Other

Affected Products

dnsmasqn/a
dnsmasqthekelleys
On-prem
Networking Infrastructure / dns-dhcp-ntp
enterprise linuxredhat
On-premOS
Operating Systems / linux-distro
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
communications cloud native core network function cloud native environmentoracle
On-premDatabase
Databases / data-warehouse-analytics
thekelleysoss-projectNetworking Infrastructureaka dnsmasq, the kellys, thekelleys dnsmasq
redhatcommercialUSOperating Systemsaka red hat
fedoraprojectoss-projectUSOperating Systemsaka fedora project
oraclecommercialUSDatabasesaka oracle corp.
and 7 more affected products View all →

Exploitability

1 exploit source identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

https://bugzilla.redhat.com/show_bug.cgi?id=1939368
bugzilla.redhat.com
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/GHURNEHHUBSW45KMIZ4FNBCSUPWPGV5V/
lists.fedoraproject.org
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FHG7GWSQWKF7JXIMLOGJBKZWBB4VIAJ7/
lists.fedoraproject.org
and 12 more references View all →

Timeline

Published
Apr 8, 2021
Last Updated
Dec 3, 2025

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