CVE-2023-34494 Use after free in n/a

High 7.5 Published 12 Jun 2023 Updated 3 Jan 2025

A heap-use-after-free in NanoMQ allows attackers to execute arbitrary code or cause denial of service via crafted MQTT messages.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2023-34494?

CVE-2023-34494 is a high-severity use after free vulnerability in n/a, published on 12 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

NanoMQ 0.16.5 is vulnerable to heap-use-after-free in the nano_ctx_send function of nmq_mqtt.c.

Weakness: CWE-416

Which versions are affected by CVE-2023-34494?

It affects 1 product.

Products include Emqx Nanomq.

How do I fix CVE-2023-34494?

No fix has been published for CVE-2023-34494 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2023-34494 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-34494 exists.

Sources

Also known as GHSA-25j6-496g-x28f.