Vulnerability identifier: #VU21405

Vulnerability risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-11779

CWE-ID: CWE-121

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Eclipse Mosquitto
Server applications / Other server solutions

Vendor: Eclipse

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a boundary error when processing an overly long SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters. A malicious MQTT client can send a specially crafted SUBSCRIBE packet, trigger stack overflow and perform denial of service attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Eclipse Mosquitto: 1.5 - 1.6.5

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External links
http://bugs.eclipse.org/bugs/show_bug.cgi?id=551160

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.