CVE-2005-1278: The isis_print function, as called by isoclns_print, in tcpdump 3.9.1 and earlier allows remote attackers t...

Security readout for executives and security teams

This is an old tcpdump denial-of-service flaw. A specially formed packet can make vulnerable tcpdump versions loop indefinitely while decoding traffic, consuming analyst time and potentially blinding packet-monitoring workflows until the process is stopped or updated. Exposure is most likely on legacy Unix/Linux systems, appliances, or investigation hosts still running tcpdump 3.9.1 or earlier and capturing untrusted traffic. Modern supported distributions are unlikely to remain exposed if vendor security updates were applied. Treat as a cleanup and visibility-resilience issue, not an emergency breach signal. Prioritize environments where packet capture supports incident response, network monitoring, or regulated evidence collection. Mitigation focus: Inventory tcpdump versions on servers, sensors, appliances, and forensic workstations.; Upgrade tcpdump using supported vendor security updates or current maintained packages.; Retire unsupported systems that cannot receive tcpdump fixes..

Prepared

Jun 29, 2026, 22:16 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.