CVE-1999-1503: Network Flight Recorder (NFR) 1.5 and 1.6 allows remote attackers to cause a denial of service in nfrd (cra...

Security readout for executives and security teams

This is an old denial-of-service issue in Network Flight Recorder 1.5 and 1.6. A remote attacker could crash the nfrd service, potentially interrupting network monitoring. The provided sources do not name a patch, CVSS score, or current exploitation evidence. Exposure is likely limited to legacy environments still running Network Flight Recorder 1.5 or 1.6, especially where nfrd is reachable from untrusted networks. Modern environments are unlikely to be affected unless they retain old NFR deployments. Prioritize only if legacy NFR is still present or exposed. For most organizations this is a discovery and retirement item, not an emergency, because current exploitation and patch evidence are not provided. Mitigation focus: Identify any Network Flight Recorder 1.5 or 1.6 deployments.; Check archived vendor or maintainer guidance for supported fixes.; Restrict nfrd access to trusted monitoring networks only..

Prepared

Jul 1, 2026, 08:44 UTC (UTC+00:00)

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