CVE-2004-1031: fcronsighup in Fcron 2.0.1, 2.9.4, and possibly earlier versions allows local users to bypass access restri...

Security readout for executives and security teams

This is an old local-access flaw in Fcron's fcronsighup helper. A user already on the system could bypass Fcron access controls and make the helper load an unintended configuration source. It matters mainly for legacy Unix/Linux hosts still running affected Fcron versions with local user accounts. Exposure is most plausible on legacy Linux or Unix systems using Fcron instead of standard cron, especially versions 2.0.1, 2.9.4, or earlier. Internet-facing exposure is not indicated; the reported prerequisite is local user access. Treat as a legacy exposure cleanup item unless affected systems host sensitive workloads or shared local users. The priority rises where outdated Fcron remains installed on multi-user servers, because the vulnerability starts after local access but weakens scheduler access controls. Mitigation focus: Inventory systems for Fcron, especially versions 2.0.1, 2.9.4, or earlier.; Apply vendor-supported Fcron updates or distribution security fixes where available.; If updates are unavailable, consult vendor guidance for disabling or hardening fcronsighup..

Prepared

Jun 30, 2026, 02:08 UTC (UTC+00:00)

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