CVE-2019-11779

Name: CVE-2019-11779
Creator: NVD / NIST
Published: 2019-09-19T14:15:10.573+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 2.74%

Last modified Jun 17, 2026

CVE-2019-11779 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.. EPSS estimates a 2.74% chance of exploitation in the next 30 days.

Description

In Eclipse Mosquitto 1.5.0 to 1.6.5 inclusive, if a malicious MQTT client sends a SUBSCRIBE packet containing a topic that consists of approximately 65400 or more '/' characters, i.e. the topic hierarchy separator, then a stack overflow will occur.

Metrics

CVSS 3.1

6.5/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.74%

84.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions	Update
Eclipse	Mosquitto	>= 1.5, < 1.5.9	—
Eclipse	Mosquitto	>= 1.6, < 1.6.6	—
Canonical	Ubuntu Linux	19.04	—
Opensuse	Backports Sle	15.0	Sp1
Opensuse	Leap	15.1	—
Fedoraproject	Fedora	29	—
Fedoraproject	Fedora	30	—
Fedoraproject	Fedora	31	—
Debian	Debian Linux	8.0	—
Debian	Debian Linux	10.0	—

References

http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00077.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00008.htmlMailing List, Third Party Advisory
https://bugs.eclipse.org/bugs/show_bug.cgi?id=551160Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00035.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D4WMHIM64Q35NGTR6R3ILZUL4MA4ANB5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFWQBNFTAVHPUYNGYO2TCPF5PCSWC2Z7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWNVTFA2CKXERXRYPYE2YFTZP4GNBGYY/
https://seclists.org/bugtraq/2019/Nov/25Mailing List, Third Party Advisory
https://usn.ubuntu.com/4137-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4570Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00077.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00008.htmlMailing List, Third Party Advisory
https://bugs.eclipse.org/bugs/show_bug.cgi?id=551160Vendor Advisory
https://lists.debian.org/debian-lts-announce/2019/10/msg00035.htmlMailing List, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/D4WMHIM64Q35NGTR6R3ILZUL4MA4ANB5/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HFWQBNFTAVHPUYNGYO2TCPF5PCSWC2Z7/
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JWNVTFA2CKXERXRYPYE2YFTZP4GNBGYY/
https://seclists.org/bugtraq/2019/Nov/25Mailing List, Third Party Advisory
https://usn.ubuntu.com/4137-1/Third Party Advisory
https://www.debian.org/security/2019/dsa-4570Third Party Advisory

Timeline

Published: Sep 19, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-11779?

How severe is CVE-2019-11779?

CVE-2019-11779 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 2.74% probability of exploitation in the next 30 days.

How do I fix CVE-2019-11779?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-11779?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST