CVE-2021-22222 Denial of service in Wireshark

What is CVE-2021-22222?

CVE-2021-22222 is a high-severity denial of service vulnerability in Debian Debian Linux, published on 7 Jun 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Infinite loop in DVB-S2-BB dissector in Wireshark 3.4.0 to 3.4.5 allows denial of service via packet injection or crafted capture file

Weakness: CWE-835

Which versions are affected by CVE-2021-22222?

It affects 5 products.

Products include Debian Debian Linux, Oracle Enterprise Manager Ops Center, Oracle Instantis Enterprisetrack, Oracle Zfs Storage Appliance Kit, Wireshark Wireshark.

How do I fix CVE-2021-22222?

Upgrade to a fixed version.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2021-22222 being exploited?

There is no known exploitation of CVE-2021-22222 in the wild and no public exploit code.

Other vulnerabilities in Debian Debian Linux

• CVE-2015-3306 ProFTPD Improper Access Control Exploited Critical 10.0
• CVE-2025-49113 RoundCube Webmail Deserialization of Untrusted Data Exploited Critical 9.9
• CVE-2026-24061 GNU InetUtils Argument Injection Exploited Critical 9.8
• CVE-2025-39682 Linux Kernel Improper Check for Unusual or Exceptional Conditions Exploited Critical 9.8
• CVE-2024-9680 Mozilla Firefox Use-After-Free Exploited Critical 9.8

All Debian Debian Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as AZL-7406, DEBIAN-CVE-2021-22222, GHSA-jpq9-r35r-969q, MGASA-2021-0279, UBUNTU-CVE-2021-22222.