SB2026061549 - Path traversal in OPNsense

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Main Vulnerability Database SB2026061549

SB2026061549 - Path traversal in OPNsense

Published: June 15, 2026

Security Bulletin ID SB2026061549
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Path traversal (CVE-ID: N/A)

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote user to overwrite arbitrary files on the system.

The vulnerability exists due to path traversal in the NTP configuration module when processing the GPS or PPS serial port parameter. A remote user can supply a specially crafted serial port value to overwrite arbitrary files on the system.

Successful exploitation can lead to total system compromise because the file write occurs as the root user. The target file must already exist.


Remediation

Install update from vendor's website.

References