CVE-2009-1783: Multiple FRISK Software F-Prot anti-virus products, including Antivirus for Exchange, Linux on IBM zSeries,...

Security readout for executives and security teams

This flaw lets a specially crafted CAB archive slip past malware detection in several FRISK F-Prot antivirus products. The business risk is missed malware at mail, file, or endpoint scanning points, not direct system takeover by the antivirus bug itself. Exposure is likely limited to environments still using the named F-Prot products, especially Exchange, mail server, file server, workstation, Solaris, Linux, IBM zSeries, or Windows deployments that inspect CAB archives. Handle as a legacy exposure and control-gap review. Urgency rises if F-Prot remains in production on mail or file ingress paths. Evidence is insufficient to claim active exploitation or a known patch path from the provided bundle. Mitigation focus: Inventory any deployed FRISK F-Prot antivirus products and versions.; Check FRISK/F-Prot vendor guidance for fixed builds or supported replacement paths.; Prioritize retirement or upgrade of unsupported legacy antivirus deployments..

Prepared

Jun 28, 2026, 10:45 UTC (UTC+00:00)

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