CVE-1999-0602: A network intrusion detection system (IDS) does not properly reassemble fragmented packets.

Security readout for executives and security teams

A network intrusion detection system (IDS) fails to correctly reassemble fragmented network packets. That means an attacker can split malicious traffic into pieces the IDS interprets differently than the target host, allowing attacks to slip past monitoring undetected. The affected product is not specified in the source bundle, and the entry is a legacy 1999-era advisory referencing the foundational Ptacek and Newsham evasion research. Exposure is undefined because the source bundle lists vendor, product, and versions as "n/a." Historically the class affects any IDS/IPS lacking robust fragment reassembly that mirrors target-host behavior. Modern next-generation IDS/IPS platforms generally address this, but legacy sensors or misconfigured deployments could still be susceptible. Low priority as an isolated advisory: this is a 1999 record with no named product, no CVSS, and not on KEV. However, treat the underlying weakness class as a durable assurance question for any monitoring investment — confirm current IDS/IPS handles fragmentation correctly rather than dismissing the concept. Mitigation focus: Identify the specific IDS product in scope and consult current vendor guidance for fragment reassembly configuration.; Ensure IDS/IPS sensors perform target-based reassembly that mirrors monitored host operating systems.; Retire or upgrade legacy detection appliances that cannot reassemble fragmented traffic..

Prepared

Jul 12, 2026, 06:17 UTC (UTC+00:00)

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