CVE-2021-39929 : Exploit Details and Defense Strategies

This CVE article provides detailed information about the vulnerability identified as CVE-2021-39929, its impact, technical details, and mitigation steps.

Understanding CVE-2021-39929

This section delves into the nature of CVE-2021-39929.

What is CVE-2021-39929?

CVE-2021-39929 involves uncontrolled recursion in the Bluetooth DHT dissector in Wireshark versions 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17, enabling a denial of service through packet injection or crafted capture file.

The Impact of CVE-2021-39929

The vulnerability in Wireshark can be exploited for denial of service attacks, potentially disrupting network communication and leading to service unavailability.

Technical Details of CVE-2021-39929

This section outlines the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises from uncontrolled recursion in the Bluetooth DHT dissector within specific Wireshark versions.

Affected Systems and Versions

Vendor: Wireshark Foundation
Product: Wireshark
Affected Versions:
Version >=3.4.0, <3.4.10
Version >=3.2.0, <3.2.18

Exploitation Mechanism

The vulnerability can be exploited through packet injection or by utilizing a crafted capture file, causing denial of service.

Mitigation and Prevention

This section provides insights into mitigating the risk posed by CVE-2021-39929.

Immediate Steps to Take

Update Wireshark to a non-vulnerable version immediately.
Employ network-level protections to mitigate potential exploitation attempts.

Long-Term Security Practices

Regularly update software to the latest versions to ensure patches for known vulnerabilities.
Conduct regular security assessments and penetration tests to identify and address vulnerabilities proactively.

Patching and Updates

Apply patches provided by Wireshark promptly to address the vulnerability and enhance overall system security.