CVE-2021-45938 Memory corruption in n/a

Medium 5.5 Published 31 Dec 2021 Updated 4 Aug 2024

A heap-based buffer overflow in the wolfMQTT library allows attackers to execute arbitrary code or cause denial of service via crafted packets.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2021-45938?

CVE-2021-45938 is a medium-severity memory corruption vulnerability in n/a, published on 31 Dec 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

wolfSSL wolfMQTT 1.9 has a heap-based buffer overflow in MqttClient_DecodePacket (called from MqttClient_WaitType and MqttClient_Unsubscribe).

Weakness: CWE-787

Which versions are affected by CVE-2021-45938?

It affects 1 product.

Products include Wolfssl Wolfmqtt.

How do I fix CVE-2021-45938?

No fix has been published for CVE-2021-45938 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2021-45938 being exploited?

There is no known exploitation of CVE-2021-45938 in the wild and no public exploit code.

Sources

Also known as GHSA-g559-2fpc-qhgf.