Is CVE-2021-3448 actively exploited?

CVE-2021-3448 has no public evidence of in-the-wild exploitation as of 2025-12-03.

What is the CVSS score for CVE-2021-3448?

CVE-2021-3448 has a CVSS score of 4 (MEDIUM severity). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N.

How do I patch CVE-2021-3448?

Patch guidance is available from thekelleys security advisories. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2021-3448.

CVE-2021-3448 - remediation guidance & executive summary

Q: Which products are affected by CVE-2021-3448?

6 products: thekelleys dnsmasq, redhat enterprise linux, fedoraproject fedora, fedoraproject fedora, fedoraproject fedora, and 1 more.

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 Metrics

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
Attack Vector: network
Complexity: high
Privileges: none
User Action: none
Scope: changed
Confidentiality: none
Integrity: low
Availability: none
Weaknesses: CWE-358NVD-CWE-Other

Metadata

Primary Vendor: THEKELLEYS
Published: 4/8/2021
Last Modified: 12/3/2025
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

Affected Products

thekelleys : dnsmasqredhat : enterprise_linuxfedoraproject : fedorafedoraproject : fedorafedoraproject : fedoraoracle : communications_cloud_native_core_network_function_cloud_native_environment

Remediation Guidance

Executive Summary

View on NIST NVD