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Unspecified Cisco Catalyst Switches allow remote attackers to cause a denial of service (device crash) via an IP packet with the same source and destination IPs and ports, and with the SYN flag set (aka LanD). NOTE: the provenance of this issue is unknown; the details are obtained solely from the BID.
Use Cisco vendor hub and Catalyst product page to widen CVE-2005-4258 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2009-0620, CVE-2009-1166 and CVE-2009-0625 for nearby disclosures in the same product family. Additional editorial context is available in The Weekly Cybersecurity Brief: February 13th, 2026.