CVE-2017-7652

Publication date 25 April 2018

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

In Eclipse Mosquitto 1.4.14, if a Mosquitto instance is set running with a configuration file, then sending a HUP signal to server triggers the configuration to be reloaded from disk. If there are lots of clients connected so that there are no more file descriptors/sockets available (default limit typically 1024 file descriptors on Linux), then opening the configuration file will fail.

From the Ubuntu Security Team

It was discovered that Mosquitto incorrectly handled file descriptors. An attacker could possibly use this issue to cause a denial of service.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
mosquitto	18.04 LTS bionic	Not affected
	17.10 artful	Ignored end of life
	16.04 LTS xenial	Fixed 1.4.8-1ubuntu0.16.04.4
	14.04 LTS trusty	Fixed 0.15-2+deb7u3ubuntu0.1

Severity score breakdown

CVSS version: CVSS v3.0

Base score 7.5 · High

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	High
Privileges required	Low
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	7.5 · High
Exploitability score	-
Impact score	-

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