CVE-2021-39928: Debian Linux

High severity, CVSS 7.5. EPSS: 5.9% chance of exploitation in the next 30 days.

NULL pointer exception in the IEEE 802.11 dissector in Wireshark 3.4.0 to 3.4.9 and 3.2.0 to 3.2.17 allows denial of service via packet injection or crafted capture file

Affected products

• Debian Debian Linux: version 9.0 only
• Fedoraproject Fedora: version 34 only; version 35 only
• Wireshark Wireshark: from 3.2.0, before 3.2.18 (fixed in 3.2.18); from 3.4.0, before 3.4.10 (fixed in 3.4.10)

Published 2021-11-18. Last modified 2026-06-17.