CVE-2021-3448CWE-358

A flaw was found in dnsmasq in versions before 2.85

Medium · published April 8, 2021

CVSS v3.1
4.0
EPSS
2%
Percentile
83.0
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
4.0 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N
CVSS v4.0
Not supplied
EPSS
0.02283 · 83.0th percentile
Weakness
CWE-358 · Improperly Implemented Security Check for Standard
Published
2021-04-08T22:06Z
EPSS history
Timeline
  • 08 APR 22:06Z
    A flaw was found in dnsmasq in versions before 2.85
    cvelistv5