CVEvulnerability

CVE-2021-3448

4.0 MEDIUM Published 2021-04-08 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-04-08
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
4.0 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
4.0 MEDIUM — CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS 2.0 ([email protected])
4.3 MEDIUM — AV:N/AC:M/Au:N/C:N/I:P/A:N
Weaknesses
CWE-358

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.

Affected configurations

• thekelleys dnsmasq (< 2.85) • redhat enterprise linux 8.0 • fedoraproject fedora 32 • fedoraproject fedora 33 • fedoraproject fedora 34 • oracle communications cloud native core network function cloud native environment 1.9.0

Related

Weakness · CWE (1)

  • CWE-358 Improperly Implemented Security Check for Standard weakness

References