UBUNTU-CVE-2021-34431

Advisory lineage Upstream: 1 Downstream: 1
Upstream
CVE-2021-34431
Downstream
USN-6492-1
Published: 22 Jul 2021, 14:15
Last modified:22 Apr 2026, 12:55

Vulnerability Summary

Overall Risk (default)
medium
26/100
CVSS Score
6.5 MEDIUM
3.1 (osv_ubuntu)
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

22 Jul 2021, 14:15
Published
Vulnerability first disclosed
22 Apr 2026, 12:55
Last Modified
Vulnerability information updated

Description

In Eclipse Mosquitto version 1.6 to 2.0.10, if an authenticated client that had connected with MQTT v5 sent a crafted CONNECT message to the broker a memory leak would occur, which could be used to provide a DoS attack against the broker.

CVSS Metrics

  • v3.1•MEDIUM•Score: 6.5CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Systems

  • ubuntu•mosquitto

    < 1.6.9-1ubuntu0.1~esm1

References (4)