CVE-2021-34432
CVSS v3
7.5
HIGH
EPSS Score
1.2 %
exploit probability, as of 2026-09-25
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
In Eclipse Mosquitto versions 2.07 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.
Technical details
- Published
- 2021-07-27
Frequently asked questions
What is CVE-2021-34432?
In Eclipse Mosquitto versions 2.07 and earlier, the server will crash if the client tries to send a PUBLISH packet with topic length = 0.
Is CVE-2021-34432 actively exploited?
Active exploitation of CVE-2021-34432 has not been confirmed. Its EPSS score was 1.2% on 2026-09-25, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2021-34432?
CVE-2021-34432 has a CVSS v3 base score of 7.5 (HIGH severity).
Is CVE-2021-34432 affecting your environment?
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