CVE-2020-13849
The MQTT protocol 3.1.1 requires a server to set a timeout value of 1.5 times the Keep-Alive...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2020-13849- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-400
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2020-13849- Updated
- 2026-11-02
EUVDEUVD-2020-6060 No score
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.
- Record
EUVD-2020-6060- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-cx2v-x9qw-9rgc No score
The MQTT protocol 3.1.1 requires a server to set a timeout value of 1.5 times the Keep-Alive...
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.
- Record
GHSA-cx2v-x9qw-9rgc- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:11575-1 No score
libmosquitto1-2.0.12-1.1 on GA media
These are all security issues fixed in the libmosquitto1-2.0.12-1.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:11575-1- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2020-13849 is a high vulnerability (CVSS 7.5) in Mqtt, published June 4, 2020. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.05%, the 81st percentile. No source names a fixed version.