CVE-2004-0580: DHCP on Linksys BEFSR11, BEFSR41, BEFSR81, and BEFSRU31 Cable/DSL Routers, firmware version 1.45.7, does no...

Security readout for executives and security teams

Certain older Linksys Cable/DSL routers may leak leftover memory contents in DHCP/BOOTP replies. For a business, the concern is accidental exposure of sensitive network data from legacy edge or small-office equipment. The sources identify firmware 1.45.7 on specific BEFSR models, but do not provide a CVSS score or current exploit evidence. Exposure is most relevant where the named legacy Linksys router models still run firmware 1.45.7 and provide DHCP service. The source bundle does not prove exposure for other Linksys products, later firmware, or modern devices. Treat this as a legacy equipment hygiene issue unless inventory confirms affected devices. If found in business use, prioritize replacement or vendor-confirmed remediation because the issue can disclose sensitive network data and the hardware is very old. Mitigation focus: Inventory for the named Linksys BEFSR router models.; Confirm whether firmware version 1.45.7 is present.; Check Linksys or Cisco guidance for fixed firmware or retirement advice..

Prepared

Jun 30, 2026, 05:11 UTC (UTC+00:00)

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