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Medium severity6.5NVD Advisory· Published Jul 22, 2021· Updated Jun 17, 2026

CVE-2021-34431

CVE-2021-34431

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.

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Affected products

3
  • Eclipse/Mosquitto3 versions
    cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:eclipse:mosquitto:*:*:*:*:*:*:*:*range: >=1.6,<=2.0.10
    • (no CPE)range: 1.6 - 2.0.10
    • (no CPE)range: 1.6

Patches

Vulnerability mechanics

References

1

News mentions

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