Wireshark · Wireshark · CVE-2021-39920
**Name of the Vulnerable Software and Affected Versions**
Wireshark versions 3.4.0 through 3.4.9
**Description**
The issue is related to a NULL pointer exception in the IPPUSB dissector, which can be exploited to cause a denial of service via packet injection or crafted capture files. This can be achieved by a remote attacker, allowing them to disrupt the service. The estimated number of potentially affected devices worldwide is not specified.
**Recommendations**
For Wireshark versions 3.4.0 through 3.4.9, consider disabling the IPPUSB dissector as a temporary workaround until a patch is available. Restrict access to crafted capture files and avoid using the affected dissector to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.