ntp: write path traversal

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Summary

CVECVE-2026-53581
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-08 23:17:24 UTC
Updated2026-09-09 14:17:12 UTC
DescriptionOPNsense 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.

Risk And Classification

Primary CVSS: v3.1 9 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H

EPSS: 0.003260000 probability, percentile 0.254510000 (date 2026-09-09)

Problem Types: CWE-22 | CWE-73 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') | CWE-73 CWE-73: External Control of File Name or Path

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary9CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H
3.1CNADECLARED9CRITICALCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
Low
Availability
High

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:L/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Opnsense Core affected < 26.1.9 Not specified
CNA Opnsense Core affected < 26.4_20 Not specified

References

ReferenceSourceLinkTags
github.com/opnsense/core/security/advisories/GHSA-872g-g543-j37m 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
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