libmosquitto1: In Eclipse Mosquitto version 1.6 to 2.0.10, if an authenticated client that had connected with MQTT v5 sent a crafted...
CVE-2021-34431 is fixed in 4 products on 1 platform, first by libmosquitto1 1.6.9-1ubuntu0.1~esm1, released October 2, 2023. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libmosquitto1 · Ubuntu 20.04 LTS (focal) | 1.6.9-1ubuntu0.1~esm1 | libmosquitto1 1.6.9-1ubuntu0.1~esm1 | Oct 2, 2023 |
| libmosquittopp1 · Ubuntu 20.04 LTS (focal) | 1.6.9-1ubuntu0.1~esm1 | libmosquittopp1 1.6.9-1ubuntu0.1~esm1 | Oct 2, 2023 |
| mosquitto · Ubuntu 20.04 LTS (focal) | 1.6.9-1ubuntu0.1~esm1 | mosquitto 1.6.9-1ubuntu0.1~esm1 | Oct 2, 2023 |
| mosquitto-clients · Ubuntu 20.04 LTS (focal) | 1.6.9-1ubuntu0.1~esm1 | mosquitto-clients 1.6.9-1ubuntu0.1~esm1 | Oct 2, 2023 |
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