CVE-1999-0791: Hybrid Network cable modems do not include an authentication mechanism for administration, allowing remote...

Security readout for executives and security teams

Older Hybrid Network cable modems shipped without any password or login check on their administrative interface. Anyone who could reach the modem over the network could take control of it using the vendor's own management protocol. For a business, this means a device meant to be managed only by the provider could be reconfigured or disabled by an outsider, degrading connectivity or exposing the network behind it. Extremely limited today. Hybrid Network cable modems are legacy hardware from the late 1990s and are not part of modern ISP fleets. Exposure would only exist in preserved legacy deployments or lab environments where these specific modems still handle traffic and remain reachable over IP. Low priority for most organizations because the affected hardware is legacy and unlikely to be in service. Only elevate if asset inventory confirms Hybrid Network cable modems are still deployed, in which case replacement should be scheduled as part of routine lifecycle management. Mitigation focus: Inventory any remaining Hybrid Network cable modem hardware and plan replacement with a supported device.; Block or filter HSMP management traffic at network boundaries so untrusted networks cannot reach the modem.; Consult the current cable provider or vendor for authenticated management options or firmware guidance..

Prepared

Jul 12, 2026, 01:14 UTC (UTC+00:00)

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