Gentoo update for Dnsmasq

Published: 2021-05-26
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3448
Exploitation vector Network
Public exploit N/A
Vulnerable software
Gentoo Linux
Operating systems & Components / Operating system

Vendor Gentoo

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Insufficient verification of data authenticity

EUVDB-ID: #VU52065

Risk: Medium


CVE-ID: CVE-2021-3448

CWE-ID: CWE-345 - Insufficient Verification of Data Authenticity

Exploit availability: No


The vulnerability allows a remote attacker to perform a DNS Cache Poisoning attack.

The vulnerability exists due to dnsmasq relies only on transmission ID when processing DNS queries and uses the same port for outgoing requests, when configured to given network interface. A remote attacker can guess the random transmission ID to forge a reply and get it accepted by dnsmasq.As a result, an attacker can perform a DNS Cache Poisoning attack.


Update the affected packages.
net-dns/dnsmasq to version: 2.85

Vulnerable software versions

Gentoo Linux: All versions

CPE2.3 External links

Q & A

Can this vulnerability be exploited remotely?

Is there known malware, which exploits this vulnerability?