Deciso OPNsense diag_backup.php filename Directory Traversal Arbitrary File Creation Vulnerability
CVE-2025-13698

4.5MEDIUM

Key Information:

Vendor

Deciso

Status
Opnsense
Vendor
CVE Published:
23 December 2025

What is CVE-2025-13698?

Deciso OPNsense diag_backup.php filename Directory Traversal Arbitrary File Creation Vulnerability. This vulnerability allows network-adjacent attackers to create arbitrary files on affected installations of Deciso OPNsense. Authentication is required to exploit this vulnerability.

The specific flaw exists within the handling of backup configuration files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to create files in the context of root. Was ZDI-CAN-28133.

Affected Version(s)

OPNsense 25.7

References

https://www.zerodayinitiative.com/advisories/ZDI-25-1022/
x_research-advisory
https://github.com/opnsense/core/commit/cb15c935137d05c86...
vendor-advisory

CVSS V3.0

Score:
4.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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CVE-2025-13698 : Directory Traversal Vulnerability in Deciso OPNsense