CVE-2020-13849

Name: CVE-2020-13849
Creator: NVD / NIST
Published: 2020-06-04T21:15:11.547+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.00%

Last modified Jun 17, 2026

CVE-2020-13849 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The MQTT protocol 3.1.1 requires a server to set a timeout value of 1.5 times the Keep-Alive value specified by a client, which allows remote attackers to cause a denial of service (loss of the ability to establish new connections), as demonstrated by SlowITe.. EPSS estimates a 2.00% chance of exploitation in the next 30 days.

Description

The MQTT protocol 3.1.1 requires a server to set a timeout value of 1.5 times the Keep-Alive value specified by a client, which allows remote attackers to cause a denial of service (loss of the ability to establish new connections), as demonstrated by SlowITe.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

2.00%

78.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions
Mqtt	Mqtt	3.1.1

References

https://doi.org/10.3390/s20102932Technical Description, Third Party Advisory
https://www.mdpi.com/1424-8220/20/10/2932Technical Description, Third Party Advisory
https://doi.org/10.3390/s20102932Technical Description, Third Party Advisory
https://www.mdpi.com/1424-8220/20/10/2932Technical Description, Third Party Advisory

Timeline

Published: Jun 4, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-13849?

How severe is CVE-2020-13849?

CVE-2020-13849 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.00% probability of exploitation in the next 30 days.

How do I fix CVE-2020-13849?

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-2020-13849?

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

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Source: NVD / NIST