The Wireshark development team has released version 1.2.14 and 1.4.3 of its open source, cross-platform network protocol analyser. According to the developers, the security updates address a high-risk vulnerability (CVE-2010-4538) that could allow a remote attacker to initiate a denial of service (DoS) attack or possibly execute arbitrary code on a victim's system.
Affecting both the 1.2.x and 1.4.x branches of Wireshark, the issue is reportedly caused by a buffer overflow in ENTTEC (epan/dissectors/packet-enttec.c)
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