CVE-2003-0039: ISC dhcrelay (dhcp-relay) 3.0rc9 and earlier, and possibly other versions, allows remote attackers to cause...

Security readout for executives and security teams

This is an old denial-of-service issue in ISC dhcrelay. A crafted BOOTP packet could make vulnerable relay software create a packet storm, potentially disrupting DHCP service and network availability. The provided sources do not show active exploitation or a modern CVSS score. Exposure is most likely on legacy systems still running ISC dhcrelay or vendor DHCP relay packages from the affected 2003-era advisories. Internet exposure is not established by the sources; risk depends on where DHCP/BOOTP relay traffic is accepted. Prioritize if the organization still has legacy DHCP relay infrastructure. The main business risk is network disruption, not data theft. Modern environments may have low practical exposure if old ISC DHCP relay packages are absent. Mitigation focus: Identify and retire legacy ISC dhcrelay deployments where possible.; Review vendor advisories for supported package updates or replacement guidance.; Restrict BOOTP/DHCP relay traffic to required trusted network segments..

Prepared

Jun 30, 2026, 03:02 UTC (UTC+00:00)

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