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Vulnerability DatabaseCVE-2021-45933

CVE-2021-45933: 
Homebrew vulnerability analysis and mitigation

Overview

wolfSSL wolfMQTT 1.9 contains a heap-based buffer overflow vulnerability in the MqttDecodePublish function, which is called from MqttClientDecodePacket and MqttClient_HandlePacket. The vulnerability was discovered and reported on September 9, 2021 (OSS-Fuzz Report).

Technical details

The vulnerability is classified as a heap-based buffer overflow with a WRITE operation of 8 bytes. The issue occurs in the execution chain of MqttDecodePublish -> MqttClientDecodePacket -> MqttClient_HandlePacket. The vulnerability has been assigned a CVSS v3.1 base score of 5.5 (MEDIUM) with the vector string CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H (NVD).

Impact

The vulnerability could lead to a heap-based buffer overflow condition, potentially causing application crashes or denial of service. The CVSS scoring indicates that while there is no direct impact on confidentiality or integrity, there is a high impact on availability of the system (NVD).

Mitigation and workarounds

The vulnerability has been fixed in a subsequent release through a patch that addresses the buffer overflow issue. The fix is available in commit 84d4b53122e0fa0280c7872350b89d5777dabbb2 (GitHub Patch).

Additional resources

Source: This report was generated using AI

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