Wireshark’s C12.22 protocol dissector contains a stack‑based buffer overflow that can be triggered when parsing certain malformed input, causing the application to crash. The vulnerability is classified as CWE‑121 and CWE‑617 and results in denial of service by terminating the Wireshark session.

Wireshark Foundation’s Wireshark software is affected in versions 4.6.0 through 4.6.7 and 4.4.0 through 4.4.18. The vendor recommends upgrading to 4.6.8 or later to remove the flaw.

The CVSS score of 7.5 indicates a high severity. The EPSS score is 0.00279 (less than 1%), and the vulnerability is not listed in KEV. While the official description does not specify the attacker’s required environment, it is reasonable to infer that the exploit requires feeding a crafted capture file to the dissector, which suggests a local or user‑initiated attack vector rather than a remote network‑based one.