Installer and debug symbols available from https://npcap.com/#download
-
[SECURITY] Rebuilt the Windows self-installer with NSIS 3.11, addressing
CVE-2025-43715--a race condition in earlier NSIS versions that could allow
local attackers to escalate to SYSTEM privileges when a vulnerable installer
is run as SYSTEM. The Npcap installer does not run as SYSTEM by default. -
Added a check for malformed OID request objects. This should prevent the BSoD
crashes that have been reported when setting up a PPPoE connection (#296). -
Fixed an issue with SendToRx mode that resulted in packet injection calls
hanging. Fixes #785. -
SendToRx mode, which causes injected packets to be indicated as receives
instead of sends, can now be enabled per capture handle using the
pcap_setmode(handle, PACKET_MODE_SENDTORX). Since this feature was
previously enabled globally via the Registry, user code can now opt out of it
withpcap_setmode(handle, PACKET_MODE_SENDTORX_CLEAR). -
The Npcap driver now can deliver packet timestamps using nanosecond
precision. This feature will be made available via the portable libpcap API
in the next Npcap SDK.