opnsense CVE debriefs

These pages are published after PatchSiren validates generated defensive summaries against stored public CVE and source evidence.

CRITICAL opnsense CVE published 2026-09-08

CVE-2026-53581

A path traversal vulnerability exists in OPNsense, a FreeBSD-based firewall and routing platform, prior to version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core. An attacker with access to the NTP configuration can manipulate the GPS or PPS serial port parameter to overwrite arbitrary files on the system as the root user. This vulnerability allows for potential disruption of system opera [truncated]