vsigupdate_OS6.3.0_91.09446_FWET.pkg: FortiGuard Antivirus Signature Update for FortiOS 6.3.0 – Official Download Resource
Introduction to vsigupdate_OS6.3.0_91.09446_FWET.pkg This critical security package delivers FortiGuard’s latest antivirus signatures (v91.09446) for FortiOS 6.3.0 environments. Designed to counter emerging cyberthreats detected in Q3 2025, it provides real-time protection against 47 newly identified malware families targeting enterprise networks. Compatible...