CVE-2021-22174: 
Wireshark vulnerability analysis and mitigation

A vulnerability in the USB HID dissector in Wireshark versions 3.4.0 to 3.4.2 was discovered that allows denial of service via packet injection or crafted capture file. The vulnerability was identified as CVE-2021-22174 and was disclosed on February 17, 2021. The issue was fixed in Wireshark version 3.4.3 (Wireshark Advisory).

The vulnerability exists in the USB HID (Human Interface Device) dissector component of Wireshark. When processing malformed packets, the dissector could crash, leading to a denial of service condition. The vulnerability has a CVSS v3.1 base score of 7.5 (High), with attack vector being Network, attack complexity Low, requiring no privileges or user interaction, and affecting only availability (Ubuntu Security).

The primary impact of this vulnerability is denial of service. An attacker can cause Wireshark to crash either by injecting malformed packets into the network being monitored or by convincing a user to open a specially crafted packet capture file (Wireshark Advisory).

The vulnerability can be exploited in two ways: through packet injection on a network or by using a crafted capture file. No special privileges are required for exploitation, making it relatively straightforward to exploit (Debian Security).

The recommended mitigation is to upgrade to Wireshark version 3.4.3 or later, which contains the fix for this vulnerability. The issue has been fixed in various Linux distributions including Debian, Ubuntu, and Fedora through their respective security updates (Fedora Update).