An out-of-bounds write in the BLF file parser causes Wireshark to crash when it processes a crafted BLF file. The vulnerability is classified as CWE-787 and can cause a denial of service if Wireshark processes a crafted BLF file. The potential attack vector is not explicitly described, but it appears to require malicious file input. No escalation of privileges or remote code execution is described in the available data, so the effect is limited to service interruption.

Wireshark Foundation’s Wireshark suffers from this flaw in versions 4.6.0 through 4.6.2 and 4.4.0 through 4.4.12. Any system running one of those releases and that accepts external BLF files is vulnerable.

The CVSS score of 5.5 indicates a medium severity, and the EPSS score of less than 1% suggests a low probability that this weakness will be actively exploited. The issue is not listed in the CISA KEV catalog, further implying limited existing exploitation. The likely attack condition requires a user or an attacker to provide a crafted BLF file to Wireshark, making it most relevant in environments where untrusted files can be opened. Based on the description, the specific origin of the attacker is not explicitly stated.