What is CVE-2021-34431?

CVE-2021-34431 is a medium-severity vulnerability in Eclipse Mosquitto, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2021-07-22.

How severe is CVE-2021-34431?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Eclipse Mosquitto

CVE-2021-34431

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.

EPSS: 0.011 (62.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

Eclipse Mosquitto
The Eclipse Foundation Mosquitto — versions 1.6, unspecified

Weakness classification (CWE)

CWE-401 — Missing Release of Memory after Effective Lifetime

References

emo@eclipse.org (x_refsource_CONFIRM, Mailing List, Vendor Advisory)

Frequently asked questions

What is CVE-2021-34431?: CVE-2021-34431 is a medium-severity vulnerability in Eclipse Mosquitto, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 6.5/10. Published 2021-07-22.
How severe is CVE-2021-34431?: Medium severity. CVSS v3 base score is 6.5 out of 10.