CVE-2021-3448

Published: Apr 8, 2021Updated: Dec 3, 2025 Sources: CVE List NVD BDUCWE-358

4.0MEDIUM

NVD MITRE

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.

No summary for this CVE yet.

CVSS Vector Breakdown

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-358 NVD-CWE-Other

Affected Products

Oracle Corp.

commercial·USaka oracle

communications cloud native core network function cloud native environmentOn-premDatabase

Databases / data-warehouse-analytics

Oracle Communications Cloud Native Core Network Function Cloud Native EnvironmentSaaSSaaS Service

Cloud & SaaS / cloud-platform

thekelleys

oss-projectaka the kellys, dnsmasq, thekelleys dnsmasq

dnsmasqOn-prem

Networking Infrastructure / dns-dhcp-ntp

Red Hat Inc.

commercial·USaka redhat, red hat

Red Hat Enterprise LinuxOn-premOS

Operating Systems / linux-distro

fedoraproject

oss-project·USaka fedora project

fedoraOn-premOS

Operating Systems / linux-distro

Fedora Project

oss-project·USaka fedora

FedoraOn-premOS

Operating Systems / linux-distro

АО «ИВК»

commercial·RUaka ivk

Альт 8 СПOn-premOS

Operating Systems / linux-distro

and 5 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

Is your org exposed to CVE-2021-3448?Request an assessment to establish which checks are appropriate for your systems. Check my exposure

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 →

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2021-3448 and every CVE in our database. Create a free account — no credit card required.

Create Free Account

Plain-language analysis

Impact assessment and exploitation scenario in plain English

Attack graph visualization

Interactive attack path and kill chain mapping

Exploit details & PoC links

ExploitDB, Metasploit, GitHub PoCs with direct links

Nuclei scanner templates

Ready-to-use vulnerability scanner templates

Full remediation guide

Patch instructions, workarounds, and compliance impact

Interactive AI chat

Ask questions about this vulnerability in natural language

Related vulnerabilities

Semantically similar CVEs and attack patterns

REST API & MCP access

Integrate vulnerability data into your workflows