CVE-2026-53581EPSS p38.8%

CVE-2026-53581CVE-2026-53581

Description

OPNsense is 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, a path traversal vulnerability in the NTP configuration module allows an attacker to overwrite arbitrary files on the system as the root user. By manipulating the GPS or PPS serial port parameter, an attacker with access to the NTP configuration can escape the intended directory and force the system to write user-controlled data to any file on the filesystem. Version 26.1.9 of opnsense/core and version 26.4_20 of BE/opnsense/core patch the issue.

Scoring

CVSS 9.0 ()
VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
EPSS0.47% probability of exploitation · percentile 38.8% · 2026-10-06T12:00:23Z
Last modified2026-09-25
Sourced from NVD + FIRST.org EPSS. Curated for EU compliance use cases by Adam Lundqvist, Founder at SQUR.