Detections
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Alpine: multiple dnsmasq packages: security update to 2.85-r0

medium Tenable Self-Hosted Container Security Plugin ID 423851

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - 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. (CVE-2021-3448)

See Also

https://security.alpinelinux.org/vuln/CVE-2021-3448

Plugin Details

Severity: Medium

ID: 423851

Version: Revision 1.8

Type: Local

Published: 4/4/2025

Updated: 7/2/2026

Supported Sensors: Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 1.2

Percentile: 0.01

CVSS v2

Risk Factor: Medium

Base Score: 4.3

Temporal Score: 3.4

Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:P/A:N

CVSS Score Source: CVE-2021-3448

CVSS v3

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.6

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

Exploit Available: true

Exploit Ease: Exploits are available

Vulnerability Publication Date: 4/8/2021

Reference Information

CVE: CVE-2021-3448